Hmm, I could come on a Wed for lunch but not H as he's at pre-sch until 12.30.
Though I am like Simps on non-pre-sch days anyway as I have to get back for 3, don't really know people well enough at school to ask them to have T.
Tricky.
Did I tell you all i'm off for a night away from the DC?! 
DH has a work do tomorrow night, then H has GOSH appts on Tues.
So I'm going up on my own to do some maternity clothes shopping (i know, 3rd time round you'd think i have everything, lol!), then meet DH, go to this work drinks thing, then we're staying in London overnight.
On Tues morning, Kirsty (our Nanny/H's 1-to-1 at pre-sch) will bring H up by train, we'll meet them off the train and go to GOSH.
She'll look after both boys on Mon, and T on Tues until I get back, yey!
If it works out, may try and fit in a couple more nights pre-baby :)
So am frantically trying to pack/sort/write lists if info for 2 days, so much work it's crazy!