On Jul 8, 4:37 pm, Cubdriver usenet AT danford DOT net wrote:

Body shape is also a consideration. I had a friend in that weight
range (250 lb) who wanted to take lessons, but the Cub was out of the
question because he couldn't get the stick back to full-stall.

And a word of warning re gliders: the training gliders that we fly at
our club allow for max. 110kgs in either front or back seat - similar
in the (once) popular K13s, with total payloads lower (e.g., around
167kgs for the 13).

That said, there are lots of clubs around London:

http://www.gliding.co.uk/findaclub/ukmap.htm