Those are some pretty disgusting regulations in London.
Reptiles (Jan. 1999) lists the top 5 beginner snakes as the corn, ball python, boa constrictor, cal king and rosy boa, all of which exceed the 2 foot limit. Also, no lizards over 1 foot and no more than 2 reptiles. Also, the by-law prohibits keeping more then 2 birds (exept that you can have 60 pigeons).
Not that I want to do anything about it or that it even effects me, I just thought I'd complain a little.