The statement is highly likely to be true, with strong and consistent evidence supporting both of its claims.First, regarding the amount received, multiple high-authority sources corroborate a very large influx of funds to Reform UK in Q3. The Political Editor of The Times and articles from Bloomberg and The London Economic all report on a single, record-breaking donation of £9 million. Bloomberg further states that the party's total for the quarter was "more than £10 million," which is highly consistent with the specific £10.5 million figure in the statement.Second, regarding this being the highest amount for any party, the evidence is also explicit. Bloomberg directly states that Reform UK "received more donations in Q3 than any other party." This is reinforced by The London Economic, which notes the party's total was "nearly as much as the other main parties combined." The context provided by the primary source, the Electoral Commission, confirms that all parties combined accepted "over £24m" in donations. A single party receiving over £10 million of this total makes it mathematically and practically certain that they were the highest recipient.All relevant and authoritative sources are consistent and point to the same official data release from the Electoral Commission. There is no contradictory evidence provided. The cumulative weight of evidence from the primary data source and multiple reputable media outlets provides high confidence in the statement's accuracy.