FrequentTraveller the capacity quote came from Heathrow’s Twitter feed:
It looks as though it may have been removed though, and replaced with:
# UPDATE: Both runways now open but it is extremely important not to travel to the airport unless you have a confirmed booking. about 2 hours ago via HootSuite
# UPDATE: Our Sth runway is now open but airlines still operating reduced schedule as they move diverted aircraft & crew back into position. about 2 hours ago via HootSuite
– possibly because some people reading will not have understood that full capacity does not mean full schedule, for the reasons that I caveated in the post above.