Cheers Counterpoint, thanks for the advice.
Yeah, this is a tricky one. I can play a 6th between 3-5, but not comfortably in that kind of figure! Stretching the hand like that makes it VERY difficult to remain relaxed and play accurately.
I was thinking that I might for those bars loose off with the thumb and use the pedal to sustain it. Will see how it goes. Perhaps my hand will get 'used' to it, we'll see.
Thanks!
SJ