London Heathrow is really busy and only has two runways, one is usually used just for landings, the other for departures.
It is not unusual for there to be up to four stacks of planes spiraling down to land, ATC calling a plane off each stack in turn.
The big problem is that Heathrow really needs either replacing or one or two extra runways
- a third runway has been approved to the north of the airport, this will require the demolition of two villages as well as the new British Airways HQ, there is much opposition!
It would be nice to move the airport maybe 20 miles north of where it is now, but doing so would still require a lot of disruption to a lot of voters (England is about the size of Conneticut with 1/5th of the population of the USA)
What would be interesting is a 24h video of planes coming to LHR