Go a few hours earlier the night before. I live where there there is a once an hour service to gatwick, several times waiting for my train, which is about 10 minutes later, I have heard "xx43 to gatwick is canceled". That wouldn't be your train but it happens and I guess its more likely with engineering works going on at night.
In any case you'll be a *lot* more comfortable waiting in a warm airport, than hanging around CJ at 130am , and you may even be able to get some sleep, either on a bench/floor at gatwick or in the Yotel, which you can rent for as little as 4 hours.
Late night public transport in the UK is sparse.
One option might be to leave a bit earlier and then try to get a bit of sleep at the airport.
23:13 Basingstoke 23:56 Clapham Junction 00h 43
00:11 Clapham Junction 00:42 Gatwick Airport 00h 31
If you don't fancy sleeping on the terminal seats their is a capsule hotel in the terminal that you can book by the hour www.yotel.com
Thats a great idea, many thanks for your help.
Many thanks for the feedback especially services at Gatwick.
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