After changing my battery I found that cruise control no longer worked. after a few weeks of generally fiddling when I could be bothered I got it working yesterday so if yours stops try this

I was fiddling and pressed/activated both the SET - and the RESUME at the same time for about a second and it started working. Not sure if this did a sort of reset or what but it was broke before and works perfectly now so I'm a happy bunny again.

Just thought I'd share in case it happens to anyone else.