Anything above 300 is running early this year due to PBP. Usually the last is early July before the nights shorten too much. Once most people are over their SR series in any given year, there isn't a lot of demand for them.
It'll be a Perm basically. You could do the Lincolnshire Poacher 400k on 11/07 and then ride home from there to bump up the distance. Get follow the A17 & A15 south after the event while the roads are quiet as far as Peterborough (services just by the A1) and then pick your way south from there. Should be easy enough to draw up a GPS track of mostly minor A and B roads until you're back on familiar territory.
Good beer there after the ride, but no loops please. Ride to Cambridge and back and then the new AC Hackney 300km from Greenwich. Just add another 100km and voila.
Anything above 300 is running early this year due to PBP. Usually the last is early July before the nights shorten too much. Once most people are over their SR series in any given year, there isn't a lot of demand for them.
It'll be a Perm basically. You could do the Lincolnshire Poacher 400k on 11/07 and then ride home from there to bump up the distance. Get follow the A17 & A15 south after the event while the roads are quiet as far as Peterborough (services just by the A1) and then pick your way south from there. Should be easy enough to draw up a GPS track of mostly minor A and B roads until you're back on familiar territory.