Do you have a full length car ramp you no longer want?  I donated Frankie's to my vet a few years back but feel it might be worth trying one with Mojo.  Living in the back of beyond, I am more than willing to pay for delivery as well as a reasonable used price.

This on ebay? £22.99 with free postage

Yes indeed but I'm not too sure about how slippery that kind would be?   Loving the 'free postage' however!   That might be as good as it gets and it's cheaper than some so if he refuses to have anything to do with it, which he might, I won't be too much out of pocket!!   I'll put that on my watch list.   Thanks