Everything was five by five until my Linksys router started telling me it had picked up a fault in the Alpha Echo Three Five unit.
I'm gonna send Frank out to have a look...more later...Cranky, out.
1730 Update: Everything seems fine now. Swapped out AE35 units and all comms are restored. Haven't been able to find a fault in the original unit, which is odd. My router assures me it's still got the greatest enthusiasm and confidence in the blog, which is good to hear. Hopefully that's the end of that.