If you fancy a few hills, I did the Chiltern Cycleway as a 400 DIY. But the top bit is pretty shit, so just cut it down:
https://ridewithgps.com/routes/33981022
That looks tasty, I take it the minor off-road bits are nothing too technical for 28mms?
I did it on 25mm road tyres and it was all fine, if a bit slow. There was a bit of wet chalk across a field in the northern section where I got off and walked for a few hundred yards.
@honk started
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If you fancy a few hills, I did the Chiltern Cycleway as a 400 DIY. But the top bit is pretty shit, so just cut it down:
https://ridewithgps.com/routes/33981022