Le Méridien de Greenwich
Done over 5 days as 4x200k DIYs (on 75") and a final 100k into the Pyrenees (on 71"), following the meridian as closely as feasible.
A few shortish routing issues sent me across fields and through forests but overall a really good ride on mainly quiet lanes, with a few faster N/D road sections to help bring the pace up. The heat though - temperature was around the mid-30s in the shade at times, and with a baking headwind across the central plains with little shelter, I was pretty cooked by the end of each day.