An essential tip for would-be Parkrunners.
Use a scanner app on your smartphone to check that your barcode is OK before you attend.
I finished my first Parkrun in 32.06 today, an improvement of three minutes over my best 5k training time.
However, my barcode wouldn't scan, and nor would a second copy that I had with me.
The marshal noted my finishing position and kept one of my barcode prints, but the results show that in my first Parkrun, I will forever be "188 Unknown".
I had a great experience though, and I'm very much looking forward to doing my second/first Parkrun next week, complete with a newly-printed, verified barcode.