Blue Badge Tourist Guide Richard "Rick" Jones explores sites in London with links to Lionel Lockyer, a physician espousing questionable remedies in the plague era. According to Chambers dictionary, a quack is ‘someone who claims, and practises under the pretence of having, knowledge and skill that he or she does not possess.’ A quack doctor, then, is a fraud.

David Bowie was one of those singers who made it through to the mainstream and when he died of cancer at the age of sixty-nine, having just failed to reach his biblical allotment of three score years and ten, politicians of all different stripes were lining up to praise him even if they had little time for his music when he was alive. People spontaneously wanted to express their grief at his passing and many of them went to a Brixton mural to do so.