Joking aside, I sourced the cartridge online myself for £60 snd paid him £80. He was here for about two hours and was incredibly careful with his work on the tap. He shut the bathroom door and secretly opened the toilet cistern and refitted the flush mechanism which he noticed had been installed...
I had a problem with my bathroom tap which needed a new cartridge. It cost £60 online and needed a very careful plumber to release the old calcified cartridge, prepare the tap and carefully install the new cartridge. Plumber cost £80 and spent a couple of hours making sure it was seated...