I would love to go ahead with the course, but with only 3 people I think the venue hire is going to be a bit much split between them. If they are happy with this, then I am still happy to run the course (and it would still be great value).
Otherwise, lets open this up to friends and other forums etc. and see how we get on.
If the worst comes to the worst, we could always do some scenarios in a friendly beer garden or something.