Just had this through from 911 & Porsche World magazine. Sounds like it might be good.
NEXT GRAND NATIONAL AUTOJUMBLE
Following the success of this year’s long-running Porsche Autojumble at The White Horse pub, Husborne Crawley, the organiser, Gerry Gibbins in conjunction with 911 & Porsche World has returned the event to its twice-yearly status.
The second Grand National Autojumble of the year will take place on Sunday 26th September at a new venue: Windsor Racecourse. The event joins 911 & Porsche World’s established annual Porsche Picnic, which has moved from its previous venue (Wellington Country Park) for the past five years. Joining the Autojumble and Porsche Picnic are enthusiasts from 911 & Porsche World’s sister titles: Classic Porsche, Ultra VW, Auto Italia and Japanese Performance.
A fabulous open-air venue with Windsor Castle and the River Thames on its doorstep, this assortment of cars at the course will create a relaxed and easy-going environment, taking you away from the hustle and bustle of race circuits or the confines of an indoor event.
So, come along and rub shoulders with the magazine’s editorial team, car clubs and readers alike and enjoy picking up a bargain at the Autojumble!

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Thanks for the heads-up. That's a good choice of venue; lots of P-car enthusiasts in the M4/Thames Valley corridors.
SS7
Should be a fun event if they get the weather