My Young Man went to London Film and Comic Con this weekend, organised by Showmasters. He'd booked his tickets in advance, and paid for a photo with Stan Lee (which he was really looking forward to). So it was somewhat disappointing for him (to put it mildly) to be stuck in a queue outside the venue for four hours when he should have been inside - he missed the time slot for the photo, and he only had about two hours inside the venue to belt round to see what he could before it closed for the evening.
I've just been looking at the London Film and Comic Con website. At the very least, I would have expected some sort of apology on the home page to the many people who were stuck outside and unable to see all the things they had been expecting to see, particularly when they had paid in advance for those things. However, all the home page says is that there are (were) plenty of tickets available at the door on the day.
A reputable company would refund the money that their customers had paid for photos and autographs that they were unable to get because they were outside in a queue - the fault clearly lies with the organisers. And where tickets were being bought in advance, so the organisers had some idea of the numbers coming, I wouldn't expect there to be long queues at all.
My Young Man doesn't expect to get his money back - and it doesn't look as if Showmasters are about to apologise.
He tells me that the same company organised the March Comic Con at Excel - which was smaller, but there were no problems with queuing to get in there.