Bristan mixer bar shower leaking from the temperature control

[BrianCox]

I installed a Bristan mixer bar shower about two and-a-half-years ago. I have recently noticed that immediately after the shower has been used, it drips from where temperature control knob turns. I attach a photo. The temperature control is on the right-hand side. The drips last for about 20secs, then they stop and no more dripping until the shower is next used. I never used to see this before. Maybe the bar is emptying itself?

I'd be grateful if someone could advise.

 

[Deleted member 120897]

You could try contacting Bristan - most mixer showers are guaranteed for 5 years, yours could be one of them.