I realised after the last post the search was broken after I had done the upgrade to Community Server 2.1. I was getting no results, others will see only new posts in the result set (I presume). Fortuantely the fix is pretty easy. I posted to the CS forum here and got an impressively quick (25 mins) reply from one of the CS Team taking me to this post, which has the solution.
Feeds et al.