Commercial flights - I can remember 4. 3 at LHR and one at ZRH in a snowstorm. All the LHR missed approaches were due to prior arrivals not vacating.
Whilst doing my PPL at Denham, probably 2 or 3 an hour until I cracked the approach
Although once I'd got my ticket I had to bale out of an approach at short finals after the Harrods helicopter kindly flew right across leaving a particularly nasty dose of wake turbulence. The controller was most upset with him !