Methodology

The data used here comes from the Electoral Commission and includes all political donations that have been documented there since 2010 and exceed £1,000.

The underlying Electoral Commission register retroactively maps all historical transactions to each party's current official registered name. As a result, historical donations made to parties before an official rebranding or name change (such as donations made to The Brexit Party before 2021) are displayed under the party's current registered entity name (Reform UK).

The donation data is updated quarterly.

Visit official source register (Electoral Commission)

The dataset covers published political contributions starting from 2010.

Records since 2026 are preliminary and subject to ongoing filings or retrospective updates by the source authority.

DonationWatch applies a minimum inclusion threshold of £1,000.00 per transaction for this dataset.

This threshold is configured by us to avoid an excessive volume of small donations, and may be higher than the minimum amount exported by the upstream registry. Contributions with an absolute value below this amount are filtered out.

Party-level inclusion threshold: To focus on active political entities, only parties with at least £10,000.00 in cumulative donations are included in the compiled dataset.

Refunds and net-zero filtering: Some registers record returned or refunded contributions as negative entries. Donors or recipient parties whose cumulative net contribution sum across the dataset is zero or negative are excluded.

Raw disclosures undergo deterministic, rule-based normalization during ingestion to standardize entity names, consolidate organizational branches, and exclude non-qualifying entries:

• Base string cleaning: All entity names undergo Unicode NFKC normalization, trimming of surrounding quotation marks and trailing commas, and collapsing of duplicate whitespace.
• Donor key clustering & country rules: A canonical lookup key (stripping all non-alphanumeric characters and case-folding to uppercase) groups casing, spacing, and punctuation variants under a single canonical donor name. Where configured for a country's loader, additional rules standardize local legal entity suffixes, strip personal titles, or map known aliases—with every merged variant listed in the Aggregated Donors section below.
• Receiver mapping & consolidation: Reported recipient names are mapped to canonical political party entities. Where registers report contributions to regional, local, or youth party units separately, they are consolidated into a single party total (listed in Aggregated Receivers below when applicable).

Important limitation on donor identity (homonyms vs. unmerged variants): Official party funding registers rarely publish unique personal identifiers (such as national identity numbers, tax IDs, or birth dates) for individual donors. Contribution totals on donor profile pages are aggregated strictly by normalized donor name. As a result, a single donor profile may combine contributions from multiple distinct individuals who share the exact same name (over-aggregation), while variations containing middle names or unmapped abbreviations may remain separate profiles (under-aggregation).

Our compiled, normalized dataset and visualizations are released under the CC BY 4.0 licence.

For researchers, journalists, and data scientists, the complete normalized dataset for United Kingdom can be downloaded via our Download bulk dataset (CSV / JSON), and the exact ingestion and normalization rules can be audited in our Inspect country loader source code (GitHub).

Dataset last processed: October 17, 2026.

Latest recorded transaction in dataset: June 30, 2026.

The processing timestamp indicates when our pipeline last synchronized and compiled data from the official register, whereas the latest transaction date reflects the most recent contribution date present in the published records.