Yes, we do!
Heathrow is Europe's busiest airport, the 8th busiest airport in the world in 2022 - just one place below its pre-COVID position. Yet, Heathrow is constrained by having only 2 runways.
For comparison, Heathrow's competitor airports; Paris, Frankfurt and Amsterdam all have at least four, allowing them to serve more destinations than Heathrow could and reducing the UK's attraction as a commercial and tourism hub.
With constrained capacity, our supply chains will suffer too. 78% of all UK air cargo passes through Heathrow, including the export of British manufactured goods such as medical machinery and hi-tech goods. That means, if delays stack up, and destinations dry up, British manufacturing will suffer.