Now you're learning sarcasm
Seriously though (and I don't think you were?), please don't dial in the wrong altitude - it just adds to the already busy R/T.
More importantly on the Heathrow Final Director frequency (120.4 - and all other sectors in London Terminal Control, and Manchester) we can see your indicated airspeed - now that has been very enlightening many times (and a major safety enhancement!).
SA