1) What are the new airport security checks?

UK airlines need to carry out enhanced security screening from certain destinations for return flights to the United Kingdom. If this applies to your flight, you'll be told whilst you're on holiday as it may mean that you need to check in a bit earlier. You might need to be at the boarding gate earlier, too.

New security measures for electronic devices
If you're carrying any electronic devices in your hand luggage that are capable of holding a charge, you'll need to make sure they're fully charged when you go through airport security. This is part of new security measures that have been introduced by airports in the UK and abroad. We recommend you keep things like mobile phones switched on until you board the plane, as there might be more checks at the departure gate.