"Also Gatwick to Heathrow is only £8.50 if you avoid central London (zone 1) get off at Clapham Junction "
I could not find this stop on the Gatwick-london line. Which train is it?

"Also Gatwick to Heathrow is only £8.50 if you avoid central London (zone 1) get off at Clapham Junction "
I could not find this stop on the Gatwick-london line. Which train is it?
Clapham Junction is a huge station on the line from Gatwick to London Victoria, Southern trains stop there, Gatwick Express trains do not (all the fares discussed do not include Gatwick Express, only Southern or Thameslink)

Thanks for answers.
The reason I asked the question is that for my hometown (Oslo) theres an airport express and a regional train from the aiport. The regional train cost a lot less, but one need to know about the service to use it.
Similarly I know by experience that to go to Gatwick theres a local train thats cheaper (but slower) than the gatwick express, and for Heathtrow threse the slower/cheaper metro compapred to the heatrow express.
I was hoping there would be similar kind of competition towards for public transport towards standsted airport. But it doesnt seem like it is, and by looking at the Transport for London Maps, it also look like Standsted is outside the oyster card zone, while Gatwick and Heatrow are inside.
Im also fan of rail transit towards airport, its "easier" to understand when travelling in a new city

Hey, I have a UK platinum card (my wife has a supp), and we use it frequently for UK lounges, particularly the ones at gatwick (and the grain store), plus occasionally at heathrow (the arrivals lounges and plaza lounges there are great). I've used their centurion lounges in the US, there's meant to be one coming for Heathrow T3, but who knows when..?
I'll try and drop the link in here -> . http://amex.co.uk/refer/hUGhLpKMA?CPID=100352024
might be blocked though

I'm struggling to see how you can do this on the train/tube if you're planning on heading to Heathrow as soon as you land at Gatwick.
Whilst trains from Gatwick to London are 24hrs, the tube to Heathrow is not (apart from weekends). In order to make the last tube to Heathrow, I think you'd need to be on a train at Gatwick by 11:30 latest, which seems unlikely given your arrival time.
You may have better luck with a bus (e.g. National Express or Megabus), as these run late and early, although it looks to me there's a bit of a gap between midnight and 3am. These can actually be quicker than taking the train/tube route, so it's not a bad way to go.
Just to answer your questions though in case I've misunderstood or it's useful to others, you can indeed get the Oyster deposit and up to £10 of credit back at a machine in a tube station. Alternatively you should be able to get a paper ticket for this journey if you go to the ticket office and Gatwick and explain - I wouldn't use the machines as you don't want to end up with a ticket to Heathrow that only permits travel on the train via Paddington. This will be more expensive than Oyster however.

I am renting a car at Gatwick airport and returning it a Heathrow airport.
How easy is it to find the Hertz car rental at Gatwick airport?
How easy is it to find your way from Gatwick traffic heading south west?
How easy is it to return a rent-a-car at Heathrow, is traffic crazy and Hertz difficult to find?

If you do not want to wait until 4am you can take the train into central London which costs £8.30 and then take the N9 bus with runs from central London to Heathrow all night about every 20 minutes, buses cost £1.50 but do not take cash, Oyster or contactless only.
https://tfl.gov.uk/bus/route/n9/?direction=outbound
Also Gatwick to Heathrow is only £8.50 if you avoid central London (zone 1) get off at Clapham Junction and go via West Brompton to Earls Court or via Richmond to Turnham Green then get the Piccadilly line to Heathrow.
Just read that Heathrow and Gatwick had major issue due the hot weather and many flights cancelled as a result and thus quite likely that as not the fault of the airline then no airline compensation likely
However travel insurance should kick in assuming they have it and one assumes that if someone can afford to bring the family to the Far East then waiting for reimbursement from the insurance would not be such a problem