I remember 10day baby brain,not sure it has even gone now DD is 2.4 yo.
Some ideas for you (I have been buying for 4.5 DS, 2.4 DD, 6 year old goddaughter, 6 year old and 2.5 year old nephew and 3 year old friends daughter. I think that covers all the kids you have to shop for too.
4 year old boy ideas
paper jamz guitar here
bakugan (tescos)
Ben 10 figures (tesco)
Ben 10 watch
same stomp rocket as above
lego star wars (tesco/amazon)
toy story lego (tesco/amazon)
toy story dvd (tesco/amazon)
how to train your dragon dvd (tesco/amazon)
2 year old boy
cars, hotwheels, hotwheels set)
dressing up (builder, pirate, policeman etc)
dvd (bob the builder, chuggington etc)
2 year old girl
fairy dressing up set (got it for 3 year old friend too)
tea set
peppa pig backpack
sparkly shoes (tesco)
PJs
Hairbands, clips, bead necklace
4 year old DD
I usually buy hair accessories, book or craft supplies when DS goes to a girls party.
We got DD a Le Van doll's house but it'd be good for a 4 year old too. It's a bit £££ but it's all we're getting DD apart from her stocking.
Don't know if Paper Jamz guitar is too boyish for your DD. Have seen keyboard etc in ELC.
I haven't had any trouble with slow delivery but I'm in Manchester.
Hope that helps my brain nearly melted getting all the ideas for the kids from us and family but I have got it cracked now.
My DH is getting a coffee grinder but that's probably no use to you. He might need coffee though with a 10 day baby!!
Play.com do vouchers too and DH can never have enough itunes vouchers.