Lasham visit May 6-8

Flying for work will bring me into London during the beginning of May. I'm considering visiting Lasham for a day or two. I would be interested in working with some of the instructors to fly aerobatics and/or winch launches. This would be a great time for me to add skills which I haven't been able to explore yet here in the States. Not to mention also very fun. Are there any instructors at Lasham that have FAA certified flight instructor ratings that would be able to do a ground launch endorsement? I've previously visited Duxford for the power flying side and would love to add Lasham for the soaring side.

Any tips or suggestions about getting back and forth from Downtown London would be greatly appreciated. I may visit Stonehenge as well to check off another on the bucket list. Maybe a nice cross country flight overhead to kill two birds with one stone? Cheers.