The Beeb is saying we will have a stiffish WSW'ly so most of the ride we will be going North or South [what a cunning leader I hear you say], and the only two 'ups' will have the wind helping [unless the Beeb get it wrong again]. We're going to W Stoke via Idsworth to make the 49.4k, and still only 277m climbing.
About Sunday morning rides
A pleasant Sunday morning ride, at a modest pace and in good company every other Sunday. Various start points.
This article describes what you should consider bringing with you.