A nice shot of Don Sim's Yimkin 'WXH 280' at the 1960 Racing Car Show. Care of the McKlien image database. Yimkin were exhibiting inside at the time and by the looks of this shot, the number plate is so fresh it looks as though it has just been stuck on. Maybe it had?
For those unfamiliar with London it was a very short drive from the Yimkin premises in Cadogan Lane to the the Royal Horticultural Halls.