shower valves and change of water pressure?

[Bettyboo]

Hi All

Thames Water recently came to fit an outside water meter and since then I have had two 1901 bristan shower cartridge/ valves dripping . Is it possible this was the cause ? When I did up the house I had a 25mm MDPE main water pipe fitted between the external stopcock to a new internal stopcock

thanks

 

[ShaunCorbs]

Yes might be depending if they let any grit / other things into the socket / pipe