WC.....
if I owned helicopters I wouldn't be getting up at 0530 tomorrow morning for work!
Wise words mate. The prob with the route is in hot weather and light or an Easterly wind. This means that traffic gong North off Heathrow when on Westerlies (Clacton, Wobun etc) should cross BUR at 3000'+
Unfortunately, a heavily laden A340 or 747 often doesn't quite make it! (they should inform us before they depart if they cannot make 243ft/nm!)
Oddly enough, only yesterday I had a helicopter (a very competent regular) at BUR indicating 1200'. He was reporting 1000' so legally the Mode C is within limits. However, TCAS works off that Mode C and the ANZ1 to LAX got airborne, a hottish day and little wind, and he was just 3 miles East of BUR at 2000 climbing very slowly. That is why we get excited about you if you are East of the track.
We have had TCAS climbs on these aircraft - which cannot be much fun when you are climbing as fast as you can!!