I am far too polite and take too much. I'm the guy who snaps one day and lets everyone have it 🙂
The thing is, the work we do is all this insurance cover stuff and taps are not covered. If it's the case of changing a washer then we will do it. Kitchen mixers (such as this) are not covered at all. I explained this to him and he was trying to make me look stupid saying he would get a proper plumber in.
Ceramic cartridges are not covered, he kept saying they might not be ceramic. I said maybe so but it is a kitchen mixer so it's not covered regardless. He didn't like it and kept bleating on about the tap valves. I told him what the problem was but he wouldn't have it.
Unfortunately I didn't get to go back but I cover his area and hopefully I will go back one day. I will know what to expect, chances are some repaired the tap with ptfe or new o ring and when he tells me that, i will happily stand and tell him that i'm happy for him but that i was happy to do the same as i explained before the valve had nothing to do with it.