Thanks, that sorted out the problem!
I have implemented CMS software on my site recently and I justed checked the config file and Id listed the site as [external links are visible to admins only]
Updated it and all seems fine (the reason I didnt attribute it to the move to CMS was because I changed over about 4 weeks ago, and this problem has only just arose).
Anyway thats sorted now, thanks alot for the help!!!!!