The smiley rather suggests you're taking the piss out of RS for misquoting a 4700µF 450v large can electrolytic HT smoothing capacitor as being a 12pF electrolytic capacitor.
Mind you, you seemed to have missed the typo on the price which seems to be inflated by an order of magnitude of error (at least when the cap in question is a low grade 2000 hour lifetime rated 85 deg C specimen). The pricing is all rather too Russ Andrewesque for my taste. :-)