A JSON file full of colours for different political parties, matched to their names as they appear on YourNextMP (which is why some parties/colours are missing: feel free to suggest more!)

partyColors.json

[
    {
        "name": "Alliance for Green Socialism",
        "color": "#00A86B"
    },
    {
        "name": "Alliance - Alliance Party of Northern Ireland",
        "color": "#F6CB2F"
    },
    {
        "name": "British Democratic Party",
        "color": "#1C1CF0"
    },
    {
        "name": "British National Party",
        "color": "#00008B"
    },
    {
        "name": "British National Party",
        "color": "#000080"
    },
    {
        "name": "Christian Peoples Alliance",
        "color": "#AA00AA"
    },
    {
        "name": "Christian Party \"Proclaiming Christ's Lordship\"",
        "color": "#9966CC"
    },
    {
        "name": "Common Good",
        "color": "#F77FBE"
    },
    {
        "name": "Communist League Election Campaign\n",
        "color": "#C71585"
    },
    {
        "name": "Communist Party of Britain",
        "color": "red"
    },
    {
        "name": "Revolutionary Communist Party Britain (Marxist-Leninist)",
        "color": "#660000"
    },
    {
        "name": "Community Action Party",
        "color": "#33FF33"
    },
    {
        "name": "The Community Group",
        "color": "#808080"
    },
    {
        "name": "National Liberal Party - True Liberalism",
        "color": "#AFEEEE"
    },
    {
        "name": "Conservative Party",
        "color": "#0087DC"
    },
    {
        "name": "2015 Constitutionalists UK",
        "color": "white"
    },
    {
        "name": "Democratic Unionist Party - D.U.P.",
        "color": "#D46A4C"
    },
    {
        "name": "English Democrats",
        "color": "#915F6D"
    },
    {
        "name": "Residents Associations of Epsom and Ewell",
        "color": "pink"
    },
    {
        "name": "Green Party",
        "color": "#6AB023"
    },
    {
        "name": "Green Party",
        "color": "#6AB023"
    },
    {
        "name": "Havering Residents Association",
        "color": "#264404"
    },
    {
        "name": "Independent",
        "color": "#DDDDDD"
    },
    {
        "name": "Binfield Independent Conservatives",
        "color": "#DDEEFF"
    },
    {
        "name": "Independent Green Voice",
        "color": "#ccffcc"
    },
    {
        "name": "Independent Kidderminster Hospital and Health Concern",
        "color": "hotpink"
    },
    {
        "name": "Independent Labour Group",
        "color": "#FFE8E8"
    },
    {
        "name": "Independent Labour Group",
        "color": "#B22222"
    },
    {
        "name": "The Independent Socialist Party",
        "color": "red"
    },
    {
        "name": "Independent Working Class Association",
        "color": "#0095B6"
    },
    {
        "name": "Labour Party",
        "color": "#DC241f"
    },
    {
        "name": "Labour Party of Northern Ireland",
        "color": "#cd5c5c"
    },
    {
        "name": "People Before Profit Alliance",
        "color": "#9400d3"
    },
    {
        "name": "Liberal Democrats",
        "color": "#FDBB30"
    },
    {
        "name": "The Liberal Party",
        "color": "#ffd700"
    },
    {
        "name": "The Liberal Party",
        "color": "#ff7300"
    },
    {
        "name": "Llais Gwynedd - The Voice of Gwynedd",
        "color": "#006400"
    },
    {
        "name": "Mebyon Kernow - The Party for Cornwall",
        "color": "#CCCC00"
    },
    {
        "name": "National Liberal Party - True Liberalism",
        "color": "#FF6600"
    },
    {
        "name": "New England Party",
        "color": "#2F4F4F"
    },
    {
        "name": "NI21",
        "color": "#008080"
    },
    {
        "name": "The North East Party",
        "color": "#841B2D"
    },
    {
        "name": "Labour Party of Northern Ireland",
        "color": "#cd5c5c"
    },
    {
        "name": "No overall control",
        "color": "black"
    },
    {
        "name": "Official Monster Raving Loony Party",
        "color": "hotpink"
    },
    {
        "name": "The Peace Party - Non-violence, Justice, Environment",
        "color": "#DA70D6"
    },
    {
        "name": "Pirate Party UK",
        "color": "#990099"
    },
    {
        "name": "Plaid Cymru - The Party of Wales",
        "color": "#008142"
    },
    {
        "name": "The Party for Poole People Ltd.",
        "color": "#6600CC"
    },
    {
        "name": "Progressive Unionist Party of Northern Ireland",
        "color": "#999999"
    },
    {
        "name": "Protestant Coalition",
        "color": "#D46A4C"
    },
    {
        "name": "The Radical Party",
        "color": "#FF3333"
    },
    {
        "name": "Rainham Resident's Association",
        "color": "#dddddd"
    },
    {
        "name": "The Referendum Party",
        "color": "#881111"
    },
    {
        "name": "Residents' Association of London",
        "color": "gray"
    },
    {
        "name": "The Respect Party",
        "color": "#FF3300"
    },
    {
        "name": "Revolutionary Communist Party Britain (Marxist-Leninist)",
        "color": "#880000"
    },
    {
        "name": "Scottish Democratic Alliance",
        "color": "MediumOrchid"
    },
    {
        "name": "Scottish Fishing Party",
        "color": "#000000"
    },
    {
        "name": "Scottish Green Party",
        "color": "#009900"
    },
    {
        "name": "Scottish Jacobite Party",
        "color": "#9966CC"
    },
    {
        "name": "Scottish National Party (SNP)",
        "color": "#FFFF00"
    },
    {
        "name": "Scottish Socialist",
        "color": "#ff0000"
    },
    {
        "name": "Scottish Unionist",
        "color": "#5555FF"
    },
    {
        "name": "Sinn Féin",
        "color": "#008800"
    },
    {
        "name": "Social Democratic and Labour Party",
        "color": "#99FF66"
    },
    {
        "name": "Social Democratic Party",
        "color": "red"
    },
    {
        "name": "Social Democratic Party",
        "color": "#7D26CD"
    },
    {
        "name": "Social Democratic Party",
        "color": "#7D26CD"
    },
    {
        "name": "Social Democratic Party",
        "color": "#7D26CD"
    },
    {
        "name": "Socialist Alliance",
        "color": "red"
    },
    {
        "name": "Socialist Equality Party",
        "color": "#960018"
    },
    {
        "name": "Socialist Labour Party",
        "color": "#EE1C25"
    },
    {
        "name": "Socialist Alternative",
        "color": "red"
    },
    {
        "name": "The Socialist Party of Great Britain",
        "color": "#DC241f"
    },
    {
        "name": "The Republican Socialist Party",
        "color": "#228B22"
    },
    {
        "name": "Solidarity - Scotland's Socialist Movement",
        "color": "#a22f32"
    },
    {
        "name": "Speaker",
        "color": "white"
    },
    {
        "name": "National Liberal Party",
        "color": "#FFBF00"
    },
    {
        "name": "Trade Unionist and Socialist Coalition",
        "color": "red"
    },
    {
        "name": "Traditional Unionist Voice - TUV",
        "color": "#0095B6"
    },
    {
        "name": "UK Independence Party (UKIP)",
        "color": "#70147A"
    },
    {
        "name": "Ulster Unionist Party",
        "color": "#9999FF"
    },
    {
        "name": "Progressive Unionist Party of Northern Ireland",
        "color": "#ffa07a"
    },
    {
        "name": "Ulster Unionist Party",
        "color": "#ff8c00"
    },
    {
        "name": "Veritas",
        "color": "#770099"
    },
    {
        "name": "Wessex Regionalists",
        "color": "#00FA9A"
    },
    {
        "name": "The Whig Party",
        "color": "#FF7F00"
    },
    {
        "name": "The Workers Party",
        "color": "#D73D3D"
    },
    {
        "name": "Workers Revolutionary Party",
        "color": "#AA0000"
    }
]