Hi there. Hoping someone can help....I have attached a picture of my shower/bath mixer tap. I move the handle to the right to run a bath, however whilst the water is running, the handle starts to slowly move to the left and the water pressure drops. Am struggling to get a plumber to come out and have a look so am hoping it might be easier to get someone if I have the right part ready. Does anyone know if this is likely to just be a worn washer, or if I need to buy a new part? If it does need a new part, is it ok to just go into a DIY shop with a picture of the mixer or do I need sizes etc? I appreciate there are similar threads already but they don't show pictures so am not sure if it is the same problem. Thanks in advance for any suggestions
