Good luck with your search. Great bike to own!
Or get a Sam. It may be a stretch as a fully loaded touring bike, but it'll be fine for average commuter/day-ride loads.
Joe Bernard
Vallejo CA.
condition: excellent
make / manufacturer: Bridgestone
model name / number: XO-2
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As long as you get the right sizing, whatever Riv you purchase will be an enjoyable ride.
And two thumbs up for Hampstead Heath!
Best of luck in your search.
Richard