The London Time Tour Bus

I’m visiting London with two friends who have never been here before. In advance of the trip we decided that a bus tour the afternoon we arrive would be a good way of getting familiar with some of the city highlights. A few internet searches later I find the Time Bus! Sure, we could use the standard tour guide bus — booooring! This tour looks campy and fun.
We navigate the tube and Trafalgar Square and arrive where the bus is supposed to be. But there’s no Time Bus to be seen. [Let the jokes about time travel to the right departure time begin.] There are some of the standard tour buses nearby so we figure we must be in the right area. One of buses is something labelled the «Necro Bus» and has the appearance of a double-​decker hearse. It’s getting close to departure time and still no time bus. So I walk over to the Necro Bus to ask about the kind of tours they offer… and this IS the time bus. So we pay our fares and prepare to board and the ticket guy says we can’t get on yet. Come back in 25 minutes. It’s raining out and we move on to find cover.
Twenty-​five minutes later we return and are allowed to board. We move to the upper level. The three of us are ¹⁄₃ of all passengers. And we’re off! The tour guide who is in character as a cheap Doctor Who knock-​off is actually pulling it off quite nicely. The moody 16 year-​old in our group is not amused. [too bad for her] Unfortunately the rain has completely fogged the small windows — that have purple curtains for the hearse look. So visibility outside is not great. The tour itself covered a surprising amount of area and the guide — with all of his schtick — did a pretty good job of describing some historical highlights.
There were a number of small things that could have made the trip better but didn’t materialize. If I was going to do another bus tour, I would certainly consider the Time Bus but am not going to go way out of my way for them.