There are a lot of cycle tracks (mostly old railway lines) in the UK that have bike rental, however very few of them have adult tricycle or recumbent tricycle.
Does anyone have the list of where you can rent an adult tricycle in the UK?
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Where abouts in the UK are you? You might want to check out the following places:
Hope you get sorted.
Near Bristol, Strawberry Line Cycles have a range of interesting bikes and trikes for atypical users, including adult trikes, adapted trikes for riders with disabilities, and tandem trikes. I found them very helpful (when I wanted to hire a tandem) to try out with my daughter. They're located right on a long traffic-free gravel bike path (disused railway) so have nice riding on the doorstep.