I was the Captain of the aircraft that was on the runway. We did all we could to get off quickly, however we were a light 319, technically with a Vapp of 119k which had been increased to 125k to help the flow. At 4 miles the aircraft behind was slightly inside the 2.5 miles, but not enough for either the co or I to mention it. However, given the fact that he was a 340, the difference in Vapp between 160kts each at 4 miles and both our final speeds would be significant.
Only after touchdown were we told to expedite off, which the copilot did a brilliant job of, and indeed VS301 was cleared to land as we exited, but he already had the up arrow on my TCAS for a go-around. Totally the correct call, and something that happens every day at LHR. Most certainly not an "incident" as someone wrote earlier. Just another go-around.
Same thing happened to me a couple of months back, this time we were a heavy 321 planning a flap 3 landing (company policy these days) vectored tight behind a RAM 737. We saw the potential for a go-around coming as we turned finals, went back over the brief for it, even had time to change to Flap Full to see if that would help. Kept an eye on how things were progressing and decided that it definitely wasn't going to work as we went through 1000 radio. We then went around in a calm and very rehearsed manner from 800 radio.
These things happen.
Squid