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Sherlock drags John along with him to consult a graffiti/street artist Raz in order to find out what paint was used for the signs. This is a bit tenuous but the picture of the policeman with a pig's head is derived from a famous piece of street art by the renowned Banksy.
The flooding link shows the way in which street artists are tackling the Olympics in London, including Banksy himself.
www.bbc.co.uk/news/uk-england-london-18946654
A thought provoking article and look carefully at what Banksy's javelin thrower is about to throw.
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Random fact - the part where they go round the back of the museum to meet Raz was actually shot in Cardiff.
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That was a long round trip then! Lol