I have just changed the taps on my bath to a mixture tap with shower attachment the pressure on the hot tap is lower than the cold. Hence I think this is what is causing the problem. Are my right in thinking that if I put a 22mm check valve on the hot pipe it will resolve this problem

Welcome to The Plumbing Page,
Are my right in thinking that if I put a 22mm check valve on the hot pipe it will resolve this problem I want to know your reasoning behind wanting to install a 3/4" check valve on a q1/2" branch feed? What would be gained b y this? Back to you, Tom