Venturi shower experienced plumber wanted

[Jobie]

Any plumbers out there in my OX49 5ST area (High Wycome, Oxford, Aylesbury) who are experienced with Ideal Standard Boost venturi showers?

 

[PhoenixServices]

I'm not experienced in that shower but I do operate in that area. What's the problem with the shower?

 

[BLOD]

It's usually the thermostatic cartridge that goes on these, unfortunately they're about £180