Nick: I might be going to London this weekend.
Darren: Driving?
Nick: Yes, not going to the centre. No congestion charge, and we have a car park so driving is best.
Darren: OK, so please call by if you're near Hemel Hempstead. Coming with Laura?
Nick: No, she's busy all week at work.
Darren: I should be around all week. Just let me know an hour before in case I am down the shops.
Nick: Okeydoke. See you soon.
Nick will drive to London alone this weekend. He will call Darren an hour earlier if he's near Hemel Hempstead.