Compiled from recent results across Dreweatts, Bonhams, Hansons, Chiswick Auctions, Special Auction Services, Sworders, Tennants, Cheffins, Bellmans, and Lyon & Turnbull. Hammer prices excluding buyer's premium. Price ranges are based on the 10th–90th percentile of recorded sales — unusually high or low results are excluded to avoid skewing the range.