Thanks. that makes sense. The computer is a new one so I am seeing it in other places too so must have come preloaded with Skype.
So , if I read this right, the fact that it has the Skype icon on means I can Skype it but alternatively I should just be able to ring it and the fact that it came back with invalid number just means that it was a misprint or I dialled it wrong from the land line rather than anything more.
When I googled the race, I ended up with 2 or 3 different sites which just gave this number and I tried a couple of the 'look for races' sites and came up empty. I have since tried a couple more of these sites and found one that does list it and this does give an Email address for me to chase up.
Thanks again.