Not just where party money comes from, but how few people it comes from, who gives across party lines, and when it arrives. Possible only once each donor resolves to a single identity however their name is spelled in the register.
Each bar is the share of a party's money coming from its single largest donor, its top three, and its top ten. A long, bright first segment means a party depends on very few people — and it pulses harder the more concentrated it is.
Donors on the left, recipients on the right — each thread is a live current of money. Only those giving to two or more appear: the people and companies funding across party lines, which is a different question from who funds whom. Hover a name to trace it.
Reported donations by week. Clustering ahead of an election, a leadership contest or a significant vote is the pattern worth asking about. Hover a week for the split.
Reporting lag. Windows end at the last fully reported month — the Electoral Commission publishes on a delay, so recent months are always incomplete. Donations are lawful and shown as public record. Donor identities are consolidated across name variants by a reviewed matching process; where a match was uncertain the records are left separate. Contains Electoral Commission Information © Electoral Commission and/or database right.