You could look to see if there's a charity PSA testing event nearby:
https://mypsatests.org.uk/events/
You can also order a PSA test kit by post from that site if you think you're up to pricking a finger and collecting about 15 drips of blood.
By the way, prostate cancer doesn't usually have any symptoms. The urinary symptoms many sites mention are usually due to an enlarged prostate (which isn't prostate cancer, although you can have both conditions). Around 80% of the men diagnosed in the UK had no symptoms. I don't know where that often-quoted stat comes from, but some recent research in the US came up with 85% having no symptoms, which given they do more PSA tests, sounds like a pretty good correlation to our figure.