greenarrow
The first part - about rubbish etc/persons need reporting to BAA, the airport authority and or an MOR if you feel strongly about it.
With regards to the ATC operation PM me and I can put you in touch with ATC Ops at LHR and maybe even arrange a visit.
B Sousa...
No there is no Helipad as such at LHR! There is a heli aiming point south of the main runway on the taxiway at Block 97. However - it is not lit and as such the southerly runway has to be used at night - which means a gap of 6-8 miles if the landing runway.
I think this is due to the fact that a relatively small amount of helicopters land at LHR - but the BAA as masters of the estate should know more!