Smiter,
SW1A 1AA is not GB's postcode. It's a much bigger place at the top of the Mall. I'm lead to believe that the tenant there has a much higher regard for the Armed Services.
If you want to make a complaint to the bloke in 11 Downing Street the postcode SW1A 2AJ will get it to him a little faster.
I'm sure he will give it his full attention.
