Ok, my baby is down for a nap so I have time to respond!
About the 18k loan thing, I was absolutely livid and I did reconsider our relationship. Not only was he stupid enough to spend all the money, he was even more foolish to keep it from me.
And as weird as it sounds, that a uni could never get something like that mixed up, they definitely did, although DH is absolutely not blameless.
I found it out because I read an email from the uni (Anglia Ruskin for that matter - I did my nurse training under them and yes they are atrocious). His explanation for it happening was that he is shit with money, and never checks his bank account. He only realised by the time it was too late.
He didn't just spend 18k per se, as much of it was used to consolidate other loans, for books, equipment and for train travel to get to uni. But still he wasted quite a bit.
I told him if ever anything like that happened again that would be it between us.
I haven't considered divorce - I know it might sound like I am a total pushover but it seems a bit extreme to me at this stage.
Plus the old adage of I do love him 
It depends on how he behaves from now on, when I put my foot down as to if my marriage really is in danger.
His idea of being a SAHD is a little silly to be honest. When I go out at the weekend (daytime to do odd jobs) the first thing he asks when I tell him I'm out is "are you taking the baby with you?"
He is a good dad, but I don't think he could manage to be a SAHD as I do most of the housework and baby stuff (probably because I am BF the baby and have more time to do the housework being on mat leave.) He generally does all the fun stuff with the baby.
When he said it, my first thought was it was because he naively thinks it would be an easy ride.
I just sent him at text, as he's at work, that following this morning's conversation we need to sit down together and work out our budget in a fair manner, and that there is no ifs buts or maybes.
My plan right now, is to set up a joint account for the household bills, and I will work it out in proportion to what each of us earns.
I am doing a weekly meal planner, and our food shopping budget will be strict and the online shop suggestion I think is a good idea.
I was actually planning on returning to work full time to begin with anyway (but his lack of support for me not wanting to and to be a mother pissed me off), but I will go part time probably from next year.
I really want to knuckle down and sort my personal finances out and get a savings plan in place.
And finally cocklodger lol it would be if I actually got any cock (I can't be bothered most of the time) 