Mrs Kay Petra - the English women's speed champion who holds the Brooklands ladies' lap record at 129.58 miles an hour - and Mrs Gwenda Stewart - the only woman to have held a world record and who still has the Montlhery track France record with 147mph - are practising for their thrilling speed duel at Brooklands on Bank Holiday Monday ( August 5th ) Mrs Petre is driving the huge 10 litre Delage once used by John Cobb and Mrs Stewart the Derby Hiller which holds nearly all the records in the two litre class It is almost impossible to prevent the engine racing up to 9,000 revolutions per minute and blowing up Photo shows Mrs Gwendy Stewart in unconventional practise dress with her car at Brooklands before a practice spin July 31st 1935