As far as I can make out Alan, the J's are racing in Christchurch Bay between 1200 and 1500 hrs on Friday, Saturday and Sunday. I've heard 2 different stories about the finish. One says that it's off Yarmouth pier and another says that it's off Hurst Point. I'm planning to go to Ocean Village on Saturday morning where I've been told they're based , then on Sunday to be at either Hurst Point or Yarmouth. Should be quite a site.
This is from the Lymington Town Sailing Club web page. LTSC are organising the event.
Here are the viewing times, they are racing 10th, 11th, 12th August
REGATTA VIEWING
If wind direction is South-West, the expected race start area will be off Milford Beach.
The yachts are expected to pass Hurst Castle at approx. 10.30am on their way to the course and will be returning (finishing) at Hurst Castle at approx. 3.00pm.