Heathrow tower is quite hard to get a visit to now, which is a shame. You certainly wont be able to plug in with an ATCO.
I would suggest you will get more out of a smaller tower, maybe Stansted, Luton or if you want to see a tower and radar in one hit try Farnborough.
All tower numbers are in the UK Airpilot by the way
Last edited by whitelighter; 11th May 2012 at 16:05.