A by-election in Canada is much the same as in UK- an election in a riding (defined voting district) caused by death or resignation.

I will get to the Australian mystery shortly- but I do not, definitely do not dog-ear, mark or otherwise deface my books. It is a miserable practice, akin to spitting on the sidewalk. Harrr-umpf!
I enjoyed the Dalziel and Pasco mysteries on the BBC TV versions distributed here in Canada. I think they removed expressions that might be unknown to a general English-speaking audience, since I don't recall any that boggled me. I may buy the DVDs eventually. I have one or two of the books, but haven't read them yet.