I'm new to the whole world of technical analysis. IDH has filled its gap, so I'd be inclined to take profits (remember, this is a paper portfolio, though). It may have a lot further to run though. I don't know.
Notionally bought at 299.5p on 24-Jan-2012 and sold today for 356p. That's a profit of 18.9%. Too bad I can't manage to do this with any kind of consistency.