I don't have a home store, I live far up the north of England and we don't have any designer stores around here at all really, it is either a good 3 and half hours - 4 hours to the nearest one.
It's PITA. I spend quite some time in Scotland, our Glasgow store has closed.
My recommendation is not rushing this time but waiting until your next trip to London. plan ahead, stay the night and go in the morning. H is another world at 10.30am.