OK...for those who are interested, I have some Hep2o coming out of a floorboard under a bath at the caziest of angle (about 15 degrees) which then (hidden behind a bath) curves up the nearby wall to a mixer-valve/tap for the bath. I need to re-route this pipe as it exits the floorboards (via elbows-hot and cold) and flexing plastic pipe to some sensible angle so that I can route 'proper' pipes to new taps on a new bath. (can't easily get floorboards up). As I'm quite new to this, I was thinking of using speedfit as I understand that you can only buy hep2o on very long (50m?) lengths and I need about 1m at most. So, it was really an economic question as to why I'd need to mix two types of plastic pipe.