This is because you correctly have an A record at www.rbclub.uk pointing to 46.20.114.134, but the A record at rbclub.uk (with no www) is pointing to a different address which is providing the web forwarding.
If you change the A record on the root domain to point to 46.20.114.134 instead of the web forwarding then it'll work properly.
Different DNS management systems represent the root domain differently. Sometimes they use an @ sign as the subdomain to indicate "no subdomain". So maybe look for that.
There are some instructions for some common registrars' DNS management pages here. Even if you're using a different system it may be similar!
Thanks
Joe
Thanks Joe, for your help and information.
All seems to be working fine now.
You were spot on regarding the @ symbol for subdomain.
Thanks again
Steve