Heathrow closed due to an electrical fire at Hayes. which is still burning at the moment. Total closedown of airport. Do not go there , you will be turned back in any case. It will be closed all day and I do not think it has a chance of opening tomorrow.
So, not only is Heathrow shut, this will mean a major problem for every airport, so if you are planning on travelling or expecting visitors there will be delays and changes. On top of the problems caused by Heathrow, the next problem for all airlines, will be that aircraft will now be diverted to other airports or have to return to original departure airport. So it will mean that all schedules will be disrupted as pilots and crews will be out of hours, planes will not be where they should be and so even when heathrow is up again many planes and crews will be in the wrong place, which will take a very long time for operations of each airline at any airport will have to sort this out. So if you have any plans to go by plane today, or have people coming to you via air , you will need to let them know the situation. (Used to be in charge of communications for an operational office )