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Cotswold Auction Company,

Cheltenham: 20%

Forum Auctions, London: 25% to £50,000, then 20% to £1m, 12% thereafter

Lyon & Turnbull, Edinburgh: 25% to £25,000, 20% thereafter

Trevanion & Dean, Whitchurch: 21%

Dominic Winter, South Cerney: 19.5%

NB: premiums may not apply or have been set at different levels where prices from sales of previous years are quoted. Exchange rates are those in effect on the day of sale.