Why don't you arrange a time and meeting place in Soho that you can use as a base to meet up between shopping stints?
I presumne you will want to visit
Barnett and Lawson?
Also, It's worth visitimg FGM in Camden and I believe she has a new stor on Oxford st opening soon too.
There are lots of vintage/antique shops in Angel/Islington that are worth a look too!
Be sure to check out Samson Soboye in Covent Garden for Mauro Slomp's pinup shoes!
Samson Soboye