re-locating sink unit

[geegee]

I wish to move a one and a half sink unit. I think it is an MFI installation.
Problem is the h & c pipes from the mixer tap are connected to the 15mm copper supply pipes with white plastic elbows I have not come across before. They are slightly smaller than average compression fittings but do not have nuts on them. (me excluded). I get the feeling they may be a snap -on type fitting, if so can they be re-used by me or do they have to be replaced? It looks like they may have a tapered ring pushed in from each side (like a collet).
Any help greatly appreciated.
geegee

 

[DAZB]

They are known as PushFit fittings and are easy to remove and reuse. this may help

 

[geegee]

Thanks DAZB
That looks like what I have under the sink. Any tips on how to remove?
geegee

 

[ollski]

if they are the twist and loc then you unscrew the big bit 1/4 ish of a turn and push the flat end into the fitting where the pipe enters, then the pipe pulls out at the same time. It may be the older oe secured by a plastic circlip to prevent removal, take the circlip off and undo the same. If unclear go here http://www.speedfit.co.uk/