This is probably a really stupid thing to ask but I can't work out where to get a breath in some of the long runs. The main problem parts are the 6+ bars from bar 49-55, and the 8 bars from bar 65-the beginning of 71. I can just about survive if I play those sections in isolation & get a big enough breath but in the middle of the piece I can't do it.
Any suggestions?

is that the one that's on the G8 list Andrea?

Yep Sarah.

I'll have a look at it later on Andrea

Bach is so nasty when it comes to breathing - I am doing the e minor one for my diploma and there is literally no where to breath