Actually, this is a terrible suggestion. This sort of split only works when both partners are earning roughly similar amounts. In a situation like the one you're about to be in, the result would be that yes, he'd be paying in way more into the joint account, but he'd ALSO have way more in discretionary spending money. To give you an example: Say he comes home with £5000 per month. You only get £500 in mat pay. Your combined bills are £3000. He is going to pay the vast bulk of the bills, of course as you earn just 1/10 of what he does. So you are only paying in say £30 and he pays in the 2700. That seems great? He's paying all the joint bills, brililant. .....
except you still have only £470. left and he has £2300.....
I do understand what you're saying. Dh and I had pooled finances prior to having DC, but I was by far the higher earner and I received my full pay while on mat leave (although I only took the 6 months that gave me that full pay). Then DH gave up his job and became a SAHD. Now our finances were a bit lower. DH found it quite difficult sometimes to bring himself to spend on himself as he felt he wasn't contributing so it can be a hard mindset to adjust to, especially as while his salary had been lower, obviously we felt the difference in not having it.
My sister and her DH pooled all finances and then each of them got an "alllowance" from that for a while. It helped to smooth that transition where she was earning less, particularly as they were both high earners (but she took almost a year, and just over a year respectively so didn't get her full pay the whole time). As far as I know, many years later, they're back to just pooling everything but, again, as very high earners, I think this is quite easy. DH and I pool everything too.... but as we have no money, neither of us hs spending more than the occassional fiver on personal spends! 