Looking for legal advice

I've reached a bit of a dead end with the company that sold me a new build house. There is an issue (there's been movement/settlement in the bathroom that has caused a tile to come away from a wall and the shower tray to crack) that for which I think they should be responsible, but they disagree.

Is anyone able to point me in the direction of some decent solicitors in Leeds that might be able to advise or take on the case?