Gawd what have I started..... Apologises I see the map I was looking at did actually have Kings Cross as a stop, but my slightly overheated excuse for a brain missed it. There are in fact 3 stops between Euston and Old Street, and the second stop is Angel!!!!
Personally I think this is just a ruse to stop us out-of-towners finding the venue in the first place. Barbie. PS: Let's hope I fair better finding my way around Munich in September :)