I like the momentum divergence coupled with the entering the lower bound - this has compelled me to take a position, albeit with a tight stop given the potential for further retracement. Target will be the gap formed earlier this year, around the 580p level. This target will require the strong to be overcome, but with results due late February perhaps the momentum will gather to break this resistance.
Another, perhaps more speculative, angle is to consider the wave structure of recent years. The most recent low could mark the final wave of a classic 5-down - this, in theory, should then be followed by a 3 wave corrective ABC structure.