[OSS Oxon] Weekend morning Thames swims?

Following from the OSS Silent Swim, would anybody be interested in one or two more unhurried swims somewhere in the Thames early on Saturday or Sunday mornings (before there are too many boats about) during August? I can't do  August 1st, 14th or 15th but other Saturday and Sunday mornings are OK at  the moment. As I live in South Cerney I would prefer somewhere upstream of Oxford (would meeting at Radcot bridge be an option?) but am willing to be flexible to suit the majority. Any suggestions for dates or places?  Regards Neil Richardson