Hi Clive,
I'm sorry to say that I'm not sure we can help with this problem. As the site is displaying correctly in our (and other end users) IE10/Windows 7 setups then I can only assume it is a specific problem associated with the original machine you were testing with.
If you can provide us more information that enables us to reproduce the problem on our local installations then we could re-look at the issue but we can't really move forward without the ability to see the problem ourselves.
Please let us know if you do find more information.