Just some comments on your OP, you can ignore but just have a think.
The first one could have been read either way, if it was something that seriously ate in your free time so that you had no time together, yes in a relationship you would both have the right to raise the lack of together time as an issue. However he said you couldn?t do it, but he could, why was it ok for him to do?
He then had an affair, up to both of you where to go from there.
He said I needed to work really unsociable hours 2pm -1am to reduce the need for childcare (family member) not surprisingly I was exhausted especially as DC was a very poor sleeper
That reads to me that you did all the night times with DC did you? What changes did he make to accommodate the need for childcare?
I eventually persuaded him that I needed to change jobs as I was literally on my knees.
Why did you need to persuade him, yes, again in a partnership you would discuss something like a job change, but ultimately if it was affecting your health he should have seen this and you both should have changed things to help, not just you.
He says that it costs too much £60 per month but he easily spends this on himself i.e. holidays with his friends
Surely you both have equal access to all monies?
If he goes on holidays with his friends, do you get the same time out/away? £60 pounds a month to me is a lot, but how much does he spend on his holidays? I'm guessing more than that
To me from what you have said he is controlling, the last question I have is what do you want to do?
Do you really feel that Relate will help?