I'm on about the same as a previous role, but with the benefit of working from home. The tax point is that about half of any increase would disappear in tax etc

I'm on about the same as a previous role, but with the benefit of working from home. The tax point is that about half of any increase would disappear in tax etc. An annual train ticket is £5k. So if I then consider travelling hours to be working hours and factor in the hassle of the journey it doesn't look good. The way I think about it is what if someone woke me up each morning and said 'I'll give you x to travel to the metropolis and back today for work' - how much would it have to be on top of what I earn now? Basically it would be more than I could expect to get via a realistic pay rise once everyone else has dipped their beak along the way.