Thanks for the advice
I had found the website and it has a great map of where all the bike hire places are and when I saw there were none near Billund I decided to try a bike forum and so joined this one.
The kids do have bikes but they are BMX and not suitable for the 50+ miles we usually cycle in a day so thought they would need decent ones.
wish I had booked flighte to copenhagen now but too late!
will try theBillund tourist office E mail you have given me
Thanks again for help