Reading about all the items you are allowed to take on board now, does this mean that my son will be able to take his PSP? Apparently you are now allowed food is this true, and if so is it only food that you buy airside?
Yes, you can take PSPs now, but make sure your cabin baggage meets the new size requirements.
As for shops:
Before security: All shops and catering outlets are open to all passengers, but any liquids and gels purchased must be packed into your luggage for check-in. Any other purchases must fit into your hand luggage.
Once through security: All shops and catering outlets are open to all passengers. If you are travelling to any destination except the USA then you can take all items purchased in the departures lounge into the aircraft cabin. If going to the USA then food is allowed, but no drinks.