'Enfield' for me conjures up images of dreary suburbia, to be honest - although when I looked the place up, apparently it's an old mediaeval market town, and does indeed have a few Georgian buildings, so it could fit. (Although most of it is 20th century). Try a Google Image Search for "Enfield Middlesex" to see what it's like. (Just searching "Enfield" gets mostly pictures of motorbikes.)
It's a while since I've been to Heathrow, but as I recall: each terminal (there are 4 - Terminal Three is for flights from LA, if that matters) has a long hall with the various airline check-in desks in it. You go through a passport check and then the security checkpoint (metal detector, x-ray machine and hand search for carry-on baggage - these days, anything that looks remotely dangerous can be confiscated) to reach the passenger area, which is basically like a shopping mall - two levels around a central atrium, with various shops, cafes, etc. The actual boarding gates are down several very long corridors (up to 10-15 minutes' walk to reach them, although there are travelators); think glass-walled corridors with rows of institutional fixed seating next to each.
On arriving, you normally walk down similar long corridors to passport control (separate lines for European Union passport holders and non-EU), then to the baggage collection area with its conveyor belts, then walk through customs (normally the green 'Nothing to Declare' channel, where customs officers watch for people to pull aside and make random checks on) until you emerge into the arrivals concourse. There's a metal railing separating the gate you emerge out of the customs area and the public area: this is normally lined with friends and relatives looking to spot 'their' person among the arriving crowd. There are also pre-booked minicab drivers and business contacts holding up signs with people's names on them. From leaving the aircraft to emerging here normally takes half an hour - less if you only have carry-on baggage, of course. There are coffee shops in the arrivals area for waiting relatives, but not the same quality or choice as through the barrier in the departure area.
Frankly, if Giles and Willow have credentials that let them bypass security and wait at the gate for an incoming international flight, they could probably also walk into a military base with them and borrow a tank (or a rocket launcher). :) Security at Heathrow is strict.
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It's a while since I've been to Heathrow, but as I recall: each terminal (there are 4 - Terminal Three is for flights from LA, if that matters) has a long hall with the various airline check-in desks in it. You go through a passport check and then the security checkpoint (metal detector, x-ray machine and hand search for carry-on baggage - these days, anything that looks remotely dangerous can be confiscated) to reach the passenger area, which is basically like a shopping mall - two levels around a central atrium, with various shops, cafes, etc. The actual boarding gates are down several very long corridors (up to 10-15 minutes' walk to reach them, although there are travelators); think glass-walled corridors with rows of institutional fixed seating next to each.
On arriving, you normally walk down similar long corridors to passport control (separate lines for European Union passport holders and non-EU), then to the baggage collection area with its conveyor belts, then walk through customs (normally the green 'Nothing to Declare' channel, where customs officers watch for people to pull aside and make random checks on) until you emerge into the arrivals concourse. There's a metal railing separating the gate you emerge out of the customs area and the public area: this is normally lined with friends and relatives looking to spot 'their' person among the arriving crowd. There are also pre-booked minicab drivers and business contacts holding up signs with people's names on them. From leaving the aircraft to emerging here normally takes half an hour - less if you only have carry-on baggage, of course. There are coffee shops in the arrivals area for waiting relatives, but not the same quality or choice as through the barrier in the departure area.
Frankly, if Giles and Willow have credentials that let them bypass security and wait at the gate for an incoming international flight, they could probably also walk into a military base with them and borrow a tank (or a rocket launcher). :) Security at Heathrow is strict.