I can imagine that it wouldn't - I wouldn't want to mess with assaults rifles, I saw some walking along at Gatwick for Wacken 2007, though we didn't do anything foolish, as tempting as it was to play the 'I'm a terrorist' game, we knew it wouldn't go down well, even if it would have been more interesting than sitting around bored to death(we caught the train the night before and our flight was at 8 am, so we had to just sit around until then)
Mind you, you've just given me an idea, candles and duct-tape?
The train prices sound a bit steep, I suppose for some, a bus works out cheaper.