Bending springs are not ideal for the job, you need to overbend by about 10-20 degrees and then bend back just to be able to remove the spring and then you will have a job on your hands, much better to get the proper tool and there not that expensive if you are going to be doing a fair bit of plumbing.
Try Screwfix, they are about £45 and they do 15 and 22mm pipe
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