@Notsureanymorepri
Well, he needs to get over himself, obviously. It doesn't matter who is the 'higher earner'. It matters that the family has all it needs and some of what it wants. Would he feel the same if he was the higher earner? No? Then suggest he get counseling to realize how lucky he is to live in a family where lack of money isn't an issue.
I'm assuming that you have a good deal of disposable income/income that can be redirected. I guess first I'd tackle the children's education. If you need to go private, you pay for it and the devil take the hindmost. If his little ego gets bruised, tough shit. He needs to understand that the children's future must have first priority regardless of anyone's ego.
My second priority would be to bring his pension contributions up to par. A well funded retirement is of benefit to both members of a couple. I'm not in the UK, so I don't know exactly how that would work. Here in the US you can't make 'voluntary contributions' to Social Security (our version of 'state pension') to boost your pension but you can to certain public sector jobs. Private sector jobs, not so much. Although an actual monthly 'pension' has pretty much gone the way of the dodo for most private jobs. They only offer various savings schemes. Some are pre-tax, some are after tax. But I digress. I'd offer to make him 'good' by either paying in lump sum or monthly contributions, or by starting some sort of retirement savings plan. But if he won't accept that, that's on him. Obviously he's being shortsighted but what can you do? I guess if you want, just be sure you have good life insurance to supplement his income should you die first.
After that, he can do whatever he wants as far as percentages of contribution to joint expenses. But he needs to STFU about it if he feels hard done by yet won't change the way it's done. What does he want you to do? Work 1 day a week so your earnings are more 'comparable' to save his fragile little ego? Fuck that.
God, men and their egos! I'm so thankful that my DH never had that issue when I was the higher earner. I didn't out earn him to the same extent that you out earn your DH, but still.