Dear London Shite team,
In replying to London Lite's threats I would refer them to the case of Arkell vs. Pressdram (1971), which funnily enough comes up in a very similar context to your case on the letters page (p13) of Private Eye, #1221.
If UKMetro think commuters can’t tell the difference between their publication and a "load of shite", then they/ we really are in trouble!
Best wishes,
D. Minnow, leading national paper