Customer has sent these pics regarding concealed shower. Apparently one of the knobs has broken and unable to operate shower valve. Has tried contacting company for replacement knob but told no longer available as old model. Wants to know practicality of replacing with new or blanking off and concealing old pipework. Judging from photo it looks like wall could be brick/breeze so expecting possibility of pipework chased up the wall however customer wants minimal removal of tiles already on shower wall. Just want some pointers of best way forward which would be appreciated. Cheers