Bought some 15mm compression elbows from my local plumbing bits supplier. Normally buy from Wickes as they are much cheaper.
I've found them much harder to do up, they seem to take a lot more force to achieve a leak free joint and they 'squeak' as you do them up.
My normal practice is to hold the elbow with Mole grips whilst doing the nut up, to avoid stressing the other side of the joint, but these take so much force the Mole grips are slipping.
How do others hold elbows whilst doing up fittings? Moles seem the obvious choice to me?