DO NOT USE THEM! Was having a lovely day out in London, Addison Lee picked us up from a beer garden and took us to a gig at Knebworth - Jay was a great driver, we tipped him well, so far so good. We had them booked for the return journey from Stevenage that night, nothing to worry about... Was standing in Knebworth Park in the middle of enjoying Liam Gallagher gig which I'd travelled the full length of the UK for - and it basically got ruined by the blunt last-minute text I received at 10pm saying the car had been cancelled. The problems for those at the same gig the previous night were well documented so there was now no way for me and my 5 friends to return to London. Finally got through to their call centre, spoke to operator and then the manager, neither of who were cooperative or willing to assist in any way. Offered multiple solutions calmly, including waiting an extra hour, and even had the driver of our first journey out to Knebworth willing to get out of his bed to come and collect us if the staff would send him a job number, and they refused to do so. Absolutely shocking service!! Almost ruined our entire weekend and would've seen us stranded out in Stevenage. If it wasn't for the kind random bus driver who managed to squeeze us onto his bus we would've been totally stuck on a cold night. I repeat, DO NOT USE THEM! Asked for an apology and some compensation to dish out to my out of pocket friends - neither came, and wasn't surprised. The worst company and people.