They do provide an analysis service here which will analyse your site and tell you how mobile-friendly it is, with advice about changes that could be made to the site.
My own website has considerable room for improvement. As it happens I am part-way through revising it anyway.
Sadly, oolite.org doesn't fare so well either

Personally I am none too happy about all this. I don't have a smart-phone or tablet, and my surfing experience is already suffering from too much phone-friendly web design - pages designed for tiny screens often look rubbish on a proper monitor, and this trend seems set to get worse.