Or you could do it the US way and just plane the boat onto the trailer.
Actually only been to Hamble Point once, and that was when I was assisting recovering a catamaran that had capsized off calshot. See Seaside Rescue link elsewhere here.
The marina all felt very crammed in - but as you note, it was on a full ebb tide at the time!
Was trying to get them back to the itchen where I had a crew of friendly people & crane arranged - however, with the boat upturned I was having to pull ridiculously hard to make progress. With hindsight I should have attempted to turn the boat the right way up, but I was nervous about losing the air bubble in the bow and sinking it in the middle of the shipping lane!
Anyway, tow rope started parting (3/4" rope - an upturned 36' catamaran is one hell of a bucket) so I handed the tow off to the hamble lifeboat. Who then took it in to the hamble and managed to drop the tow and get the capsized boat (strong ebb tide) stuck under the moored boats in the marina. I had chosen itchen to derisk the recovery, acknowledging it would have taken me another 4 or so hours to get him there.
I know we're not meant to be critical of the rescue services, but the coxswain on the hamble lifeboat that day was terrible. He repeatedly rammed my tow line, hard enough that I thought he was trying to break it on purpose. His coming alongside me was more akin to a collision than coming alongside. And then he dropped the towline in the marina! My boat handling is materially better than his. Fortunately the critical team that recovered the injured crew were all excellent.