Had a new loo fitted and it's leaking from a flexible pipe that s had a water isolating valve put on it the leak is actually coming from the valve not the flexi , he's been back to tighten it but it's still leaking he said something about taping it if it's still leaking and I call him again which I have to , I know nothing about plumbing but since having this loo fitted have been on internet and I'm a bit worried about the flexi pipe angle as it's a very tight one and I have read about them splitting ??????? Please could anyone advise my best course of action . Have taken a few pics . Thanks for any advice you can give me .