We flew in and out of LGW 4 times this summer., twice international, twice intra-Europe, both N and S terminals. We had OK meals for airport food. You need to wait until your gate is posted on a board before you can go to the gate. They post the gate usually about 1/2 to 1 hour before departure. But plenty to see, shop, dine in the meantime. We took the Gatwick Express train to Victoria Station then a cab to the hotel. We got the cheapest train tickets, group rate (3 of us) in advance on line, good for the day. We arrived in the S terminal, train leaves from the N so involved a shuttle. Signage not great but people helpful and guided us. Train clean, quick, runs often. We hired a car back to the airport, and with three people it was a wash compared to the train, but a lot less dragging of bags. This was very early on a weekend. The driver said other than that time, it's chancy as traffic can be very bad. So, if weekday, rush hour, peak traffic time on weekends, take public transportation whichever airport you choose. Have not been to LHR for years but fellow travelers don't seem to like it.