As it happens, I've just been looking at this incident on WebTrak in connection with a thread on Rumours & News (British Airways 777 diverts to Goose Bay ...).
When the 777 returned to LHR, whatever happened with the landing caused the runway (27R) to be closed for nearly 20 minutes. The Virgin 346 did a go-around from 610 ft, and the three aircraft behind it were switched across to 27L.