Good point about stairs, Steve....hadn't considered that ! Living in central London, hills are a bit scarce. But council block towers are not . I head up to Muswell Hill and Hampstead Heath at the weekend. Colin, your email frightened me a bit ! My mara PB is 3.25, did Trionium in 4.14. I think they call it the picnic, because we'll need to stop for a meal break.