Rare stamp sold at auction

Rare stamp sold at auction; ENGLAND: London: EXT Auctioneers behind desk / Auctioneer on telephone / Man wiping sweat from his brow / Auction catalogue with 'The Chartwell Collection' and picture of Post Office Mauritius stamp on cover / Auctioneer speaking as auction in progress SOT / Close shot catalogue in hands of bidder / Bidder with catalogue resting on briefcase / General view of auction room / Blown-up image of franked envelope (item up for auction) on screen / Row of bidders (including man taking telephone bid) / General view bidders / More of auctioneer taking bids SOT PAN to stamp shown on screen (Mauritius Tuppeny Blue)