Yes, I work in Heathrow ATC. I have done so for nearly 13 years, and I now work in the ATC Operations department.
What experience in this sort of thing do you have?
2min separation is required for a/c departing on the same routes, depending upon the relative speeds. In the UK, at certain airports, and with CAA approval, you may use 5nm instead providing that the routes diverge. If they diverge by more than 45 degrees, and speeds are comparable, then you can get the 1 minute separation.