I have made 13 landings at LHR this month (so far ....!) and the AVERAGE hold has been 14 minutes, with only on one occasion there being no delay (5 Jan @ 19:30ish) and the worst being 39 minutes in cavok on 8 Jan due lack of parking space with no slot restrictions inbound from a near European location. We landed on that occasion on 09L, with the normal spacing increased to 5nm so that everyone could vacate at the end onto 23. What the F**k was that all about, we ended up pretty short of fuel and had a stand allocated (unlike the T1/2/3 traffic) and almost had to divert just because of GMC problems.
That is nearly 3 hours of holding (mostly at LAM), I leave in 9 years and suspect that it can only get worse. We need a fourth runway now (or a plan to use 23 regularly as a 3rd in the interim).
Time for some joined up thinking by ATC (and the politicians ... no chance there then as they are the results of their predecessors education policies).
P****d off of Camberley ... possibly