Duffbert's Random Musings

1 - The secret to most of it is to recognize rhyming slang. "Butchers", for instance, is short for "butchers' hook", which rhymes with "look". (In much the same way as a woman's bosom might be refered to as "Bristols", which is short for "Bristol City", which rhymes with...) A wobbly would simply be a fit. "Boocky", I can't help you with -- although it's usually a name ("Bucky"). There's a Cockney-to-English site you might want to use:
http://www.cockneyrhymingslang.co.uk/

2 - Stan's nailed it. This comic strip is very confused though. The character vacillates between "northern" and "southern" colloquialisms. Much of the dialogue is cockney (rhyming slang from East London), but then switches to northern English (e.g. "summat", "a little bevvy and that")

3 - Sorry about the double. Reading on, I see that "Boocky" is the English fellow's cousin ("baker's dozen"), so it is indeed a name. "China plate" is "mate", and "gormy" is "clueless". I'm hoping that nosh-up (summat t'eat) and bevvy (summat t'drink) are clear enough. (Oh, and "summat" is "something", taken from a very old usage of "somewhat".) And another British slang site:

http://www.effingpot.com/slang.shtml