hi all. can anybody tell me how to undo talbot pushfit fittings, i had a leak on one the other week after it froze ,turned water off and tried to undo the dam thing,didnt have any joy so i went to the local plumbing merchant to see if there was a special tool for the job, the guy there went onto talbots web site to see if there was but found nothing, he told me that they dont undo you have to cut it off the pipe. doesnt sound right to me, idid cut it off the pipe and took the fitting back to them to see if they could undo it, no joy. the fitting is black in colour and connects to the blue polypipe stuff any ideas, i cant send a pic as i am computer stupid,