The route is a fairly straightforward 100k out to the west, then back. So via Mortimer, Aldermaston, Brimpton, Burghclere, Kintbury, Hungerford (Tutti Pole). Then Little and Great Bedwyn, Burbage, Pewsey, Woodborough, Beechingstoke, Urchfont, Market Lavington, Erlestoke to Bratton (cafe). Return to Hungerford by reversing that route, then Wickham, Welford, Boxford, Chieveley, Hermitage, Yattendon, Bradfield, Theale, and back to the start. Not many hills.
The ride has a reputation for wind - either against you on the way out, or on the way back.
I won't be there, either riding or helping I'm afraid. The revised date clashes with something else that Mrs D would never forgive me for cancelling.