Heathrow will only accept 100,000 passengers per day this summer.

According to London Heathrow, the daily passenger limit will be 100,000. Although Heathrow Airlines had already reduced capacity in response to the government agreement, the airport insisted that they go much further.
In a letter on Tuesday, CEO John Holland-Kaye stated that while some airlines have taken action and some haven’t, he believes that future action will be made to guarantee that passengers have a safe flight.
We have thus made the challenging choice to establish a capacity cap, effective from 12 July to 11 September, he continued.
He continued, noting that some summertime travel would either be postponed or cancelled, and we apologies’ to anyone whose plans were affected.

To reduce the number of people, airline partners have been ordered to stop selling summer tickets.
British Airways has already had to cancel numerous flights due to a staffing shortfall.
Heathrow apologized on Monday for the lengthy lines, baggage problems, and aircraft cancellations.