I believe 3 hours is the official minimum. It's usually plenty of time, but the ring road you will travel on the connecting bus -- the M25 -- can have some of the worst traffic anywhere. If you will be making the transfer anywhere near what might be considered rush hour, 3 hours is cutting it close. Make sure your BA flight is not the last of the day.
Although exhorbitantly expensive, you could always take the Heathrow Express to Paddington (15 minutes) and then the 705 bus to Victoria, and then the Gatwick Express to LGW (30 minutes). I did it once in just over an hour when I didn't want to risk traffic. About 20 pounds at the time (now about 25).
Programs: AA EXP-1.6MM, Hilton Diamond, ManU & Chicago Bears #1 Fan
I've done it few times an never had a problem,
I did Fastrack through immigration,
I did not have checked luggage,
and finally, I knew exactly where to go
If the OP is stuck in the immigration hall for some time because 3 other planes landed at the same time and the OP does not have Fastrack and if the OP has to collect checked luggage, and if the OP doesn't know where to go, THEN.....
3 hours IS NOT ENOUGH!!!
The aboves are all IFs. I would say that subtracting/adding 30 minutes for each if would be the way to estimate the time needed.
The shuttle trip can be as small as 55 minutes on weekends or as long as 2.5 hours in weekday rush hour. Unless you are in weekday rush hour 3 hours is sufficient if as the previous poster mentioned you do not get unduly delayed. I believe they raised the minimum official connection times to 4 hours now.
Go to National Express Site where you can enter the start and end and see the entire list of routes. Now that National Express has consolidated the three or four lines that used to run between the two, there is very frequent service between the two airports.
FWIW - the minimum connection was still 3 hours in mid-August, when I last passed through there. Don't know if it's been raised since then.
If you do have checked luggage, you'll have to carry it between airports and then re-check it. But there are special lines at each airport for dropping off bags, so a 3 hour connection still works ---- barring any unusual delays.
No; they are not. BA allows 1 piece no more than ,iirc, 6 Kg
So why is that? I've run into this on all the European airlines I've run into lately. Specifically, why on earth, do the European carriers care how much your carry-on lugguge weighs? I mean, it doesn't matter where the bag ends up, carry-on or checked, it uses the same amount of fuel. Or are the Euro-carriers admitting the Airbus planes they buy have flimsy overhead compartments?
I'm thinking, since the intra-Europe "business-class" seems no different from coach, other than you get to sit at the front of the plane and get a free copy of the Financial Times, this is one of the few value-adds for their "business-class" of service: you get hassled less about the weight of your carry-on than the unwashed masses do in Economy.