I have ridden firstly as Calendar, when handlebars snapped off and I nipped home to Cheltenham to Xc steeds. Then in Spring as a Perm; that was nice in the warm sun.
Route does use roads across the Cotswolds, which could be problems with poor whitetop (read: snow/ice) roads/lanes, some late in day, so dark! After doing 4x200 last Jan, this year I am committed to (my) Perms till March, so glad I did not enter. Though it might still be difficult to find that decent weather window for a main road 200 Perm.
RRTY-folk are not having it easy this month.
The management (Perms Sec + Events Sec) are quite friendly converting weather-affected Calendar events to Perms. Org only has to discuss.
SteveP