Everthing on previous trips has gone well but the last time not so i booked parking at Heatrow from 1am arrived at 1.30am only to find the desk closed and no one there.I rang a number that I eventually found on an an email to be told the desk will not open before 3am. I do think that the booking programe should be sophisticated enough to prevent people booking too earlier a time. When somene did eventually turn up at 2.55am he was obsessed with the fact my entrance ticket said 1.30am well I had been there for 1and a half hours so what did he expect other than that things were fine.