My and DP are both full time students, and I really recommend it. Not from the financial perspective necessarily (although it's managable) but from a quality of life perspective. I really enjoy us both talking about doing our work together - even though our courses are very different. It's a little tough at assignment deadline time (like now, I really shouldn't be here - just having a little break
) but other than that, it's great.
Also, college is way more flexible that work, as you're expected to do the majority of it in your own time, you can fit it round your DCs to a large extent, and the holidays are fantastic.
But, most importantly, it's so much fun to be in a learning environment IMO - way more fun that work! I'm really enjoying learning new stuff. I'm much happier now that I've been in years 
OK, to the money - I can tell you what we get but this is under the old system - the Tories are probably going to change it all and anyway the fees rises are about to come in, so you'll need to check what actually applies to you:
From memory, so figures are approximate ...
We are considered to be on a low income.
We get:
- just under 5K loans each
- a parent's learning allowance of about 1.5k.
- a special support grant of nearly 3k. If the rules are the same, you will qualify for this because you are both students.
So that's £19K between us, which is pretty decent I think (admittedly some of it is loans but hey ho).
We also get a bursary from the uni of £1k each, and we're eligible for student bank accounts - my co-op student account has £1.5k "free" overdraft.
You also get 85% of your childcare paid - assuming you are not still getting the childcare part of Child Tax Credit (I simply canceled it the week before I started college).
It's worth trying to think laterally about how you can save or make money. For example I own a flat in London. We've rented that out, and moved to near the uni. We started house hunting about 6 months before term actually started, and eventually found a lovely 4 bed flat with a private landlord who was happy for us to sub-let 2 of the rooms, so we do just that. We also let the rooms to foreign language students in the summer.
It's possible you qualify for income support too. We did look into this but we're not eligible, I can't remember why.
I really recommend you go for it! It's the best decision I've made in years (after having DS of course
)