Digg Submit problems

I am having trouble submiting links from my blog to Digg. Has anyone else had this difficulty.

My links look like this

http://www.top5picks.co.uk/blog/index.php/nintendo-give-away-free-wii-remote-jacket/

But when I submit to Digg it says ‘Are you sure that’s the right address? – This doesn’t appear to be a working link – please check URL and try again.’

it’s strange and quite annoying as I want to put news stories on Digg quite a lot.
Any help would be appreciated…