I'd like to save some money for a transfer from Gatwick to Heathrow. It seems that the best way to do it is to book
National Express bus ticket before trip. I didn't find price if I buy it from a driver but I suppose that it's more expensive.
When I open their site I need to select time, but it's a bit hard to do in case if I've never been there.
Could someone, who knows Gatwick airport, tell me how much time do I need to estimate for immigration control + luggage reception + search of the bus stop? If my flight arrives at 11 o'clock, will a bus ticket for 12:30 be ok?