FROZEN PLaNET  BBC1 Wednesday 9pm  SPOOKS  BBC1 Sunday 9pm  THE SLaP  BBC4 Thursday 10pm  IT'S 18 years since Sir David attenborough's Life In The Freezer but one stunning image has stayed with me: that of a penguin narrowly escaping becoming lunch for a psychotic porpoise. as it hirpled back on to the ice, white front spattered with blood, barnet askew, Pingu looked like young George Osborne in full Bullingdon Club attire after a town vs gown altercation with local yobs (though, of course, back in 1993, George was not yet known to the wider world and may still have been calling himself Gideon).  Frozen Planet returned Sir David to minus 70C temperatures for a look at life, and the obligatory sex and death, at both poles. He's never been north before but some of the opener felt quite familiar, though that's probably down to previous attenboroughs being so brilliantly vivid and this palpable truth: there are only so many ways to skin a penguin. Everyone remembers the killer whale vacuuming up a beachful of seals in Life On Earth; here a gang of them toyed with Sammy on its lonesome on a crumbling floe before dragging the exhausted animal to the depths.  Improved filming techniques enable Sir David to describe the killings in ever-finer detail. Great, if that's what rocks your floe. Is it just me or does this series feature more death than earlier ones? Maybe satellite channel fang-fests of gorillas being eaten by crocs which are flattened by heffalumps which are killed by lions before a python swallows everything whole have caused the BBC's Natural History Unit to up the gore score. But it could be just me, for I've always been jessie-ish about depictions of the animal kingdom's natural order.  Incredible footage all the same. In an ungodly Roger Dean snowscape (none more ungodly, as all prog-rock fans know), I followed those wolves right up to