Assuming you have the permission of the leaseholder to make these changes, then you could try Roy Darville who has done some work at a couple of properties at RQ. His email is roydarville@hotmail.co.uk. As is common with a lot of plumbers he is often quite busy so he may not be able to react in a hurry.
Many people have used Ian Norton over the years. He's not the cheapest by any means but all reports are that he does a very good job. His email is ianj.norton@btinternet.com and he knows the site well.
Thank you, Simon and James for the contact details. Yes, we have the landlady's consent, that's why I started to search for plumbers. She'll choose whom she'd like to do the works.
