Ok where to start ?
There are several bicycle mobility centres around the UK that sell recumbent's IIRC nearest are Swadlincote and York
To a man they will recommend a Hase Kettwiesel:-
For you and your riding environment it has 3 major advantages.
- Seat height is approximately 14" - so easier to get on and off
- as there is no cross boom or 2 wheels to get in the way - it is easier to get on and off [ Tadpole ]
- incredible turning circle - needed if you cycle around UK paths/pavements
these are tricky to get through on a tadpole trike due to lack of turning circle and huge amount of clutter they put inside them !
I owned a Kett for many years and then built the Python in front of it here , seriously low seat @ 8" !
If you have an inside leg about 30" + you can come and try the Python ?
Your best first move is to buy Brads second book :-
Evil Genius bikes & scooters
This has abridge versions of both the Streefox & Deltawolf plans plus stuff on electric bikes.
all the best Paul