Its less noisy than the underground and gives you some idea of the layout of North London. Especially from South Tottenham to Hampstead. It also seems quite quick and one could easily imagine Betjeman getting lyrical and informative about it. Only the bookshops might prove expensive -I found a nice anthology by Grigson -“The Cherry Tree” and a biography of Byron by Frederick Raphael-quite a combination. Excellent Oxfam bookshop and Louis coffeehouse-now Polish instead of Hungarian.