R1100GS in the UK to rent
 

Here's an enterprising soul who has a bike "for sale" although the basic idea is to rent it and return it to him undamaged.
Full details are in the advertisment on ebay and it looks like a good deal compared with the usual cost of rental bikes.

1995 BMW R1100GS ABS 21K MILES YOURS FOR £220/WEEK LIKE CHEAP MOTORCYCLE RENTAL | eBay

It's hard to see any catches in this offer (no relationship to me!).