Where (UK) can we rent an adult tricycle or recumbent tricycle
Where abouts in the UK are you?  You might want to check out the following places:


London Recumbants - http://www.londonrecumbents.co.uk/bikes_we_hire.html
DTek - don't have a web site but can be emailed on dtekhpvs@btopenworld.com
FutureCycles - futurecycles.co.uk


Hope you get sorted.