I found the right store today... They had plenty of Fortunm & Mason's Earl Grey and Darjeeling (neither of which work for me) but not a single tin of their English Breakfast tea or Royal Blend! Bummer.
Not to come home empty handed I picked up some more East India Company Royal Breakfast, which is superb, and a trial run at Ahmad's Assam. I had tried Ahmad's English Breakfast tea before but found it mediocre. Let's hope their Assam is better.
Stitchawl