As you may have seen on the news, the UK's security status has now been raised to 'critical' following an anti-terrorism operation, meaning that hand luggage may not currently be carried onto aircraft. This appears, from the media news bulletins, to include everything except a clear plastic bag of paperwork.
So if you are looking at carrying photo gear, now may be a very good time to see what options exist for transporting and protecting equipment in the aircraft hold. As I've had ports damaged inside substantial Pelicases in the hold I am in a quandry as to how to pack gear anyway.