I was at a controller/pilot forum run by GATCO a few years ago when a very well respected/very well liked Senior pilot from a large user of LHR (not BAW) stated that in his opinion "in a capacity strapped situation (LHR) if there is not the odd go-around, ATC are not trying hard enough!" I think he had a very valid point. The controllers at TC and LHR do a very good job and are second to none in the world. Go-arounds are an occupational hazard.