Does it need to be packable?
I know you don't have MEC there, but maybe you can find somebody carry this. Replacement blade is 8 bucks, and everything folds into the large tube.http://www.mec.ca/Products/product_detail.jsp?PRODUCT%3C%3Eprd_id=845524442238013&FOLDER%3C%3Efolder_id=2534374302696925&bmUID=1238103515284
For me it is the classic Sven saw. They have a 15" and a 21" model.
I didn't think they were common on your island...it's pretty common in the US.This is the website - SwensawREI has the 15" - LINK
Mike, have you ever tried a UST SaberCut saw? I use mine occasionally; and it's great!
Here's an interesting saw which I've never seen here - BCUK-Bob Dustrude Quick Buck SawHere's a UK seller - Tamarack Outdoors