Ho, ho, ho. Now people really will get the wrong impression.... Still, looks like it was a good 'un. I'd love to have a go at this one at some point in the future.
GDZ
Getting the focus correct was the hardest job, my Canon 450D has a flash so switch to automatic mode and press shutter to focus (flash goes mental). Switch lense to manual focus (the lense then stays focused) and switch mode to exposure control and set to something like 15s. I used a 50mm fixed prime 1.8f.
Hard times focusing? That sounds like me - did the Fluffster moan at you a lot for not being able to focus? Careful Prof, soon he'll being giving you a hard time for living in Surrey....
GDZ
Top stuff there fellas, having just done my first tunnel I certainly now appreciate how difficult it can be to take any photos, let alone crackers like you have achieved here. Really well done all!