Growler, I'm full of sympathy for the annoyance we endure at the hands of the premenstrual sex, but how can you blame her for costing you a new tyre when the tyre had a nail in it? That has happened to me twice in the past year, and each time I have handled the situation correctly, but
still had to have the tyre replaced. Modern tyres aren't really made to be repaired, and it is often more cost effective to just get a new one anyway. Besides - would you really feel confident driving on a motorway with a repaired tyre?
It sounds like £90-100 of the money spent was due to your own insistance that you fit a specific, Michelin tyre. £150 sounds inordinately expensive to me - I had a Bridgestone 4x4 tyre replaced on my CRV for just £60. What sort of vehicle are we talking about? A tractor?
I suspect you're just a bit sick of eachother's shit, which is perfectly understandable after 25 years together.