Lee,
This is so awful for you, I feel I should try to think up some way you can get round it.
How about
1. Offering to go in now to sort it, as you know how important they are, and that he/she needs the system up and running for the opening of business tomorrow morning.
2. Throwing the area into total chaos by sabotaging the national grid, Guildford depot
3. Ringing up in the morning with two wet peices of cotton wool up your nose, hacking and spluttering, saying you'll try and steam it out over a bowl of Vick, and you'll try to get there after lunch.
Now, if you were seeing Mr Clarke, I'd offer to go for you.............
Really bad luck Lee!
Look forward to reading the interview though!