Thanks both. Quite right - if it ain't broke, don't fix it. Although I sometimes fix things until they break...
I think it might be that the menu bar doesn't display properly on IE11 as I was on my laptop last night and couldn't see the Quick Links drop down menu but now I can (on my phone and in IE9).
So, unless you would want to update the site to cater for IE11, I guess nothing needs to be fixed. No biggie.
Thanks again for responding.