Walking between Baker Street tube station and Harley Street, we go along Marylebone Road – a very busy dual carriageway that passes both the Royal Academy of Music and Madame Tussaud’s and forms part of the A501 London inner ringroad.

The pavements along Marylebone Road are one of the dirtiest and most polluted areas of London – lots of stationary traffic and diesel engines.  So Timothy keeps his breathing slow and careful by staying in his bag.