I would envisage you encountering some form of delay
This is whats been issued to us at work for any of our colleagues who may be travelling.
"Colleagues will probably be aware of the news reports this morning about increased security at all UK airports. The attached link to the BBC News gives up-to-date information.
http://news.bbc.co.uk/2/hi/uk_news/4778615.stm
Heathrow is currently closed to all incoming flights unless currently in the air and our Travel Agent also advise that Heathrow is also closed for outbound flights. Please see the attached link
http://news.bbc.co.uk/2/hi/uk_news/4778871.stm?ls
Please be aware that there will be delays and you should check in for flights as early as possible.
The Department for Transport (DFT) have advised that heightened security levels will be imposed on all UK airports today.
ALL PASSENGERS WILL BE UNABLE TO TAKE HAND LUGGAGE INTO THE CABIN WITH THE FOLLOWING EXCEPTIONS:
pocket size wallets and pocket size purses plus contents (for example money, credit cards, identity cards etc (not handbags));
travel documents essential for the journey (for example passports and travel tickets);
prescription medicines and medical items sufficient and essential for the flight (e.g. diabetic kit), except in liquid form unless verified as authentic.
spectacles and sunglasses, without cases. contact lens holders, without bottles of solution.
for those travelling with an infant: baby food, milk (the contents of each bottle must be tasted by the accompanying passenger) and sanitary items sufficient and essential for the flight (nappies, wipes, creams and nappy disposal bags).
female sanitary items sufficient and essential for the flight, if unboxed (e.g. tampons, pads, towels and wipes).
tissues (unboxed) and/or handkerchiefs
keys (but no electrical key fobs)
Passengers may take these items through the airport security search point, in a single (ideally transparent) plastic carrier bag. Nothing may be carried in pockets.
This information was issued this morning so I am not sure how current it is. Good luck
