That is sound advice for, quaint though it may seem, your camera may be confiscated and destroyed if pictures are taken anywhere on the airport premises.
In fact, Britian is one of the more tolerant nations - here we will only destroy the camera and possibly fine you a couple of hundred quid. In Greece, you could go to jail for five years (as plane spotters found out a few years ago) as indeed you could in Middle East countries - and if they thought you were spying, you may even cop the death penalty!
You may feel aggrieved by the state of T4 and Gatwick, but please be very careful if any staff members faces appear in your pictures that you send for publication. Airport staff are protected by by-laws and unwittingly identifying someone, whose personal safety might be compromised, could lead to criminal prosecution.
Oh dear! My post seems a bit hostile - it isn't meant to be! God knows that T5 is the only London Airport building at the moment that is anywhere close to decent! All I am asking is that you heed a bit of friendly advice!
What a load of rubbish. I guess you work in security at LGW. Please be advised you have no right to remove property from somebody and doing so against their will would be theft. If you are a police officer I hope you issue them a receipt and do it in accordance with law and if it comes to court the CPS will ask for a seizure and destruction order if they want to. If I was presiding I doubt I would grant it and I have granted such things for other matters. The photos on the camera are also the property of the person concerned and if you delete them you will be open to a charge of criminal damage. Bye-laws do not override the laws of the country. I despair when I read things like this.