Hi Mark

If you are connected to the internet via a router, try unplugging it, leave it for 30s or so and then plug it back in.

Check your firewall and security settings as this can also block certain files from certain sites.

Try the Google Chrome Browser, as this seems to work on the odd site that that IE and Firefox doesn’t.

If the above fails, email your ISP as it may be something at their end.

Hope this helps

Bill