Cornwall graffiti grannies speak from knitting 'HQ'

9 February 2012 Last updated at 07:22 ET Help

Grannies who sneak out late at night to brighten up Cornish towns with their knitted graffiti invite a television crew into their secret headquarters.

The grannies - or "craftivists" - who love to knit, say the reason is simple: it is to make people smile.

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