P207 CEEFAX 207 Tue 30 May 19:19/37    CHRISTIES REPORTS  ENCOURcGING ST RT   Shareholders in the art auctioneer,   Christies International, have been   told of a good start to the year.     Chairman Sir Anthony Tjnnant said:   " hj year has started encouragingl9   in most areas of business, with a   good increase in overall sales when   compbred with last year."     He told the annual meeting that a   number of major collections had   been sold in New York, while spring   sal s in Honk Ron wet up b 50%.     He also revealed limited change to   Christies' new commission scales.  j Headlines 201 Shake price 221