Greetings again,
I have built a ramp for me ma (not an ambulance, my Mother).
I used 1 metre square decking tiles and a couple of shorter ones, all bolted together and supported on concrete tiles.
The joints on the tiles allow the end ones to bend to horizontal.
There is a step of 2-3" at the end of the ramp which I will attend to during the week. I came across a ramp in the Argos Catalogue and will see if that works.
My Ma is quite chuffed with it.
Francis