AC
If the prop is the second plane, yes you can do reduced sep but, as Gonzo quite rightly said, you have to do FOUR mins behind (same route) because that's what Terminal Control want. Otherwise the phones are red hot from some Sh£t hot radar guy having kittens.
Don't blame the tower controllers beacause at Heathrow there's NOTHING we can do. Your rules mate (it's in the MATS 2 for all to see) and if you did some tower, you'd realise you pompous a$s.
P7