Hi guys...

Just wanted to check.. am having a mixer shower installed.. the plumber says i need to have a pressure reducing valve for my cold as it runs from mains.. however, for this to happen he would need access to the pipes which are behind my newly tiles walls so obviously a problem there.. is it essential i have this valve.. i just had a new combi boiler (worcester 35CDi) put in (not sure if this info is helpful)

thanks in advance