We will be meeting in the Marble Arch Underground station (in case it is raining or snowing) at 11:30 at the Oxford Street exit i.e. look to your left when you exit the barrier.
On my first visit to that area I thought that there was only one building of interest. On my 2nd visit I discovered that there are in fact 7 buildings to look at in that short walk.
Please let me know if you will be coming.