There was in fact no delay – this was simply the change of clocks to daylight-saving time. In Britain, the change occurs on the last Sunday of March, and is considered to take place at 01:00 GMT, when it becomes 02:00 BST.
So the taxi was booked at 00:55 GMT, and it arrived ten minutes later at 02:05 BST.
I hope you're not going to set your clocks the wrong way and turn up two hours late for everything. Remember the American mnemonic: "spring forward, fall back".