Thanks for the replies guys I really appreciate it. After I posted I went back out and ripped off the free wheeling hub. I think I had put it back on in such a way that it wasn't engaging properly. I sat down and had a real good look at how it all works and now know, so I guess it wasn't wasted time.
After putting it all back together again, I was able to stop both front wheels (one at a time) and the other kept spinning. So I agree, it was all normal.
Many thanks again.
