Ive just bought some nice new shiny speedplay frogs and i dont want them stolen off my bike as there quite expensive (60 quid).

I was thinking that whenever i leave my bike in Central London (high bike crime area) or elsewere in London for a longish time I could take just one pedal off. I'm guessing that theives are less likely to steal one pedal than a pair, even though i'm well aware there are plenty of crackhead numpties out their that will steal literally anything. This may get a bit tiresome after a while though

Anyone got any ideas how to secure pedals?