I'm about 40 mins from Bourn so I think I will aim to get there about 10:30/11ish, have a quick Bacon Butty, look at SnR's homebuilt and try to leave Bourn about 12:30 ish. That should get me at Kemble by 1:30ish, I will have to leave Kemble about 3ish to get back to Redhill by Nightfall.
Sounds a goer.