First, make sure that you know all of the rules that apply. (Nobody is allowed to employ you without obtaining a permit from Suffolk County Council. That permit can be withdrawn if your school reports that your school work is being affected by your employment):
http://www.direct.gov...entsRights/DG_4002945
Then you're going to have to do quite a lot of hunting around for yourself. (Jobs for young people are rarely advertised). Start with the obvious things, such as contacting all of the news agents in your area to see if they're taking on new delivery staff. If they're not, ask if they can add your name to the list of people who are interested in working for them. (Also check the jobs page of the free 'Star Advertiser' that drops through your door every week. They sometimes need people to deliver it).
Then start asking around independent shops (such as 'corner shops' and similar convenience stores) to see if they need any help. It might also be asking local at local hairdressers' salons as well. In many towns it's worth asking market traders if they want help but Ipswich's small market, on the Cornhill, probably won't offer much.
Remember that the rules restricting your employment don't apply if you're self-employed. Think what you're good at and how you might make money from it. I read about an eight-year-old who had a thriving antiques business! With a bit of assistance from your parents, with transport, you might be able to try a bit of trading at car boot sales and table top sales. I also used to teach a 14-year-old who was earning more than I was, from writing for several computer magazines. (I was writing sports reports, for the East Anglian Daily Times, when I was 14).
At a more mundane level, you might be able to make money, on a self