I rode from Reigate to Lincoln last year to visit my parents – 176 miles. Was on my Genesis Croix de Fer so not entirely a road bike. Really wasn’t too bad, I did hit a pheasant and ride into the back of a car in Spalding, that was the only bad bit.
I just kept hydrated with Nuun electrolyte tablets in the water, and had some energy bars and dried apricots.
Wish I’d done an extra little loop to make 200 though :-(