Some of the best Bordeaux ever produced among the 291 lots on offer at sale organised by Farr Vintners.A four-day auction of one of the finest private collections of wines ever seen in the United Kingdom begins tomorrow, with total bids expected to exceed £2m.Some of the best Bordeaux ever produced are on offer, including two cases of 1990 Château Pétrus, the wine recently laid on for David Cameron and friends by the Tory party treasurer, Michael Spencer, at their party conference in Birmingham. The cases have a reserve price of £34,000 each.