I don't know how many incidents occur due to crews not having noted correctly the surface wind, or the temperature / dewpoint from the ATIS. Maybe it happens lots, but I don't recall ever seeing an investigation into it. I have, however, seen quite a few investigations of level busts due to incorrect QNH input. I had one inbound crew today give me the QNH, which they'd noted from the ATIS, but they were 10mb out (not just 1). I think you can cut the LHR and LTMA guys a bit of slack, given their traffic densities, in following our rules and attempting to minimise a known problem!
PS as mentioned above, when an a/c type is changed at short notice, the FPL isn't always amended as it should be, and without wishing to be too dramatic, that can be a matter of life or death if the vortex category changes without ATC becoming aware.