Richard, welcome to this thread! The whole journey of finding a storable boat for a flat and small backyard garden and motor with the Ford KA and use on the Thames has been an adventure!
Thank you for introducing me to the notion of a foldable boat, he Frib. F-RIB 460 | F-RIB
the larger one looks exciting, although it is still only rated at 20HP maximum which is bit of a shame since the Bombard Aerotec 380 takes 25HP.
I can't comment on the Excel SD360 as I haven't seen one, the you tube videos of the SD375 look good, although I wonder if the Aerotec 380 isn't a bit more durable. Good value though. I paid £1000 for my 380 second hand built 2001.
I am itching to go out in mine again, however, it is in the chandlery, Chas Newens in Putney to fix a very small leak and they discovered I have no thermostat so that is good and the electric start now works, it must have been the battery low amp connection plug I fitted. Perhaps the battery is not holding the voltage long enough.
There are plenty of launch points on the Thames and although it is rough sometimes, it is fun and safe if you have, I suggest: high N self inflating lifejackets with crotch strap, portable VHF radio, waterproof, with DSC distress key - I suggest this one
is great and the London Coastguard have just got the DSC distress channel.
Where in London are you? I am in Fulham and use the Broomhouse Drawdock.