No need for third runway. Just stop people using Heathrow as a Europe to USA transfer lounge.
Percentage of transfer passengers: 30% (
https://www.heathrow.com/company/com...ts-and-figures).
Let's say half of them are transferring to UK airports. That leaves 15% of Heathrow's traffic doing next to nothing for us, bar an airside Costa and souvenir Beefeater. Just flying in and out.
Simply tax non-UK transfers at double APD. Instantly capacity freed up for people who people who actually come to the UK and contribute to the UK economy. No need for third runway. Problem solved
