Thanks for the responses - obviously I have trawled ebay, but I don't want the overpriced unravelling Cr*p that is mostly listed.
The alternative proper flexible jointing sections listed appear to be too short for what I need.
Just thought that some one who had engineered, rather than bodged, a modified exhaust might have a recommendation rather than some sarcastic (ebay FFS) reply.
Problem is with the std flexi pipe is as its mild steel it very quickly rusts solid and stop being flexi.
Stainless is probably the way to go but expensive.
I would try and shorten the gap between the fixed pipes and use a stainless flexi with either weld on oe clamp on cuffs for a nice looking job.