I managed to get some NHS physio and they confirmed it as Golfer's Elbow. Aside from the exercises they gave me, I left it well alone for around two months before starting to climb again (lots of hill walking and cardio at the gym.... the latter reminded me why I hated sport at school!). Happily the physio's recommendation to give it some vertical grief coincided with a pre-booked sport climbing holiday which went well, loss of endurance aside.
Since then it's been steadily getting better. The insertion still aches and pulls after climbing, but I'm back bouldering at resonable intensity 3-4 times a week and there haven't been any major regressions / relapses. It still gives me enough grief though that I whack it in a bowl of ice and take ibuprofen after every session, and I'm still doing physio exercises (from the athlon article). On the one hand, I have enough hope for the near future that I haven't written a reply to the Best of 2008 thread.... just in case I send something significant in the next week. However, every time I come home I am terrified that the pain means that this time I've knacked it and I'm going to wake up next morning in agony. It's the hope that kills!