Hello Dougan
This is mostly an american/canadian site
I am English myself, so probably best if I offer advice for you
As you are young, you are restricted at the moment to how many hours you can work
Newspaper rounds are always popular - have you tried to your local newspaper agents?, helping with milk rounds is always a popular job, or used to be
When I was your age, I would negotitate with my parents on what jobs I had to do and what jobs I could be paid for doing
As a result I would always mowed the lawns for my parents on saturdays, of course when they told me how much of a good job I had done, I upped the price - wow did that cause some friction
Also, do your parents know anybody who can offer part time jobs to you on saturdays, cleaning up this, or sorting out that
Speak to your praents and family - you never know how many little jobs you can get for a few quid at a time until you ask
Good luck to you