Thanks all!
Lots of food for thought.
I asked because I have an offer - basically my job at another company for nearly twice as much money i.e. £300k+
DH is a SAHD and we manage very well on my current £160k as a household income, including paying £40k of it into pensions, overpaying the mortgage, supporting some charities, and generally being quite comfortable.
I said to DH I didn’t think it was worth moving, because even though it’s basically the same job, it’s still a new team, new company, and there is always a risk in moving jobs (if I got long term sick during the probationary period, for example). Also might be more travel and I won’t really know until in the job.
DH wanted me to research what we might want to spend the extra on, so thank you for contributing to the research 
I like the idea of a housekeeper, although DH doesn’t even like the idea of a cleaner.
Kids are teenagers, so no childcare costs, and both are very settled and getting top grades at the local high school, so we are lucky there.
A slightly larger house would be nice.
Most of all I like the idea of retiring early. I’m nearly 50, and can’t see me still doing this in 20 years. I have genuinely no idea how much of an investment portfolio would be needed for that though. I always assume we are going to be eating cold beans straight from the tin in retirement.
Still not sure it would be worth the risk of the move though.