I went down to and across London this last year and enjoyed it. Moored at various places, Berkhamsted on the way down is nice, also moored near Uxbridge, Greenford and Little Venice. Had to breast up at latter, tied to rings or other boat, seems the norm in London. No one was in other boat but had no problem. Similarly moored twice near Hackney, found other boat tied to mine whilst I was out, had no problem carefully untieing other boat, moving off and carefully retrying it. Maybe I was lucky, but didn't have any problems mooring Victoria Park, Hackney Wick, Limehouse or Tottenham. I enjoyed the Regents Canal, you get through it in about four hours and hardly any free moorings but you pass through some interesting areas, Camden, Kings Cross and Islington. Enjoyed it more than I thought and did an extra circuit taking in the Rivers Lea and Stort, which were both lovely, especially at their northern ends.