Remember the airport is a complex bucket of companies with roughly aligned interests, making money.
Until the fan blades are rather brown and muddy they will do nothing. The airport operator would cut the PO but the costs will be charged back to all the airlines, retailers and other parties so no one wants the prices up. In the end it will all go back to the traveller. I think we had a thread here just recently about the prices of a sandwich at an airport.
This is not a UK specific issue, anyone heard of a commercial airport that has already deployed something? As I follow this industry I think I might have heard and so far - diddly.
I await the analysis of the cost at LGW and I expect a lot of the airport operators are already making calls to find out. This will be the tipping point to get some trials and pilots in place. There seem to be a couple of vendors in the game. I don't think any of them are are an answer in their own right. I would expect the military will be involved so they can provide backup as they did at LGW. The military will probably also be interested for their own use in a lot of tier 2 locations.
The existing systems tend to perform detection and maybe some electronic suppression but if the drone is under GPS control in order just to disrupt then its down to hardware to knock it down. Given a free range I love the CWIS, https://www.youtube.com/watch?v=-L0ZAGOuaqg
however what goes up must also come down and the people around the airport already have an axe to grind.
As you say, this is going to be a big area in the future. Not just for fear of bomb's, nerve agents and other payloads but for privacy.
Prisons have been the first to move on this. Drones carrying phones and drugs in have been a story for ages. A tender was released last year but was cancelled for some reason. Military bases and some government offices would benefit as well. Those celeb hotels which host the weddings sold to popular magazines for a fortune need to protect the parties involved.
Some changes are probably needed to the law I suspect, not my specialist area. I vote CWIS, take a stand before it becomes a plague. The noise alone is terrifying. Did you see the size of those bullets. I could fit on on top of the MB ML with some of Dave's Neoprene.