Home DIY

Bit of a delayed response so maybe you have sorted this now, but I had a similar problem removing old stuck bath mixer tap a few months ago, required significant contortions to get near the screws and backnut, and despite buying multiple different tools to try and loosen it (including failed basin wrench attempt) I ultimately failed and instead taking advantage of a gap of 1-2mm between tap body and bath, I cut through the tap tails from above the bath, using a fine tooth 12 inch hacksaw blade with one end bound with plenty of tape to make a handle, cutting on the pull stroke. A sharp blade cuts the brass easily but it still took me an hour or two, used several blades in the end.