The Pilot Shop in Victoria might be a bit out of the way, its a bit of a walk from the Station... What might be an idea is if you order online?
There are plenty of Pilot Supplies..
Pooleys Flying and Navigational Products and Accessories,
afeonline.com and Sporty's Pilot Shop.
For the purposes of PPL.. I just bought a beginner Pooleys Headset from Ebay for about £50.. You could spend £250 on a David Clark H10 13.4 but if I were you I would much rather spend the difference of £200 on some more flying time!
Save the expensive headsets for later!
Gerry is an old timer.. so generally very friendly.. If you can get to Elstree with family or on your own there (by Car) there is a Pilot Shop on Elstree Aerodrome - a Pooleys Shop.
Scoobster