If you're hoping to do the Tour of Gloucestershire this year (18th June), I've set up a preparation ride on 22nd May to Bath & Wells. This will be a good benchmark if you're considering the ToG but aren't sure if you have the fitness for a full 300km day out.
Route details below / on club calendar. It's an auda (200+ km), about 2,300m climbing. Leaving Pump Rooms at 8am, hoping to get back by 6pm.