Heathrow is our countries biggest airport, of course the security and policing will be different than that of gatwick.
What should that matter? Gatwick is a fairly important airport and rather busy. What about Amsterdam? that’s the biggest airport in the Netherlands so does that mean that should be shut off to ‘enthusiasts’?
I don’t think it should matter what size the airport is. If it is in the interests of giving people an area from which people can easily take pics or registrations which is controlled by some sort of security team then it will make the ‘jaggies’ stand out from most ‘enthusiasts’. 😀