just in case someone else wants to get their head around the financial outlay of childcare costs : Southwark council has a complete list of all nurseries and childminders that are registered with them, AND THEIR FEES, on their website. Even if you don't live in Southwark, other councils may have the same.
Turns out there are cheaper nurseries where I live (PFEW!) and, surprisingly, childminders seem to be a cheaper option! So I have some bedtime reading for the, oh, next 16 months! (until I get back to work)
Defintely not going to private school these two!
mariana yes I would be planning to go back fulltime. I really enjoy my job, it is not a job I could do in 2.5 days, unless I get someone to jobshare with me, which is something they are happy to help with at work (theoretically), but TBH I think we would need the cash!