Can't access vodafone.co.uk on my home network - all other sites are ok!

[#1]

Strange problem this.
I originally thought there was a problem with my desktop as I can't acces voda using Chrome, IE11 or edge. Tried all sorts of fixes to no avail. However, it now seems it is a problem with all machines on my network. It seems to be the only site there is a problem with (at least that I know of). I have rebooted the router but it makes no difference. No router configuration has been changed for months and no updates applied. I am at a bit of a loss and would appreciate some pointers.
Thanks
Jon

[#2]

Just done a search (which perhaps I should have done before  ;D)
wonder if this is the problem?
http://community.plus.net/forum/index.php/topic,145969.0.html
A bit of a pain if it is. can anyone offer a solutions without relinquishing my static IP?

[#3]

Also, not sure if it is related but IE11 troubleshooter reports that 'one or more network protocols are missing on this computer' when I get it to troubleshoot the connection but I've tried all the fixes for that without success.