Here’s a good use of a free taster session voucher by Nuffield Health at Paddington Recreation Ground (now run by GLL).
I was approached by someone in the park who offered me a free taster session for their newly refurbished gym. He then took my contact details and tore off the other half of the voucher for me to use as my pass. Unfortunately, as you can see the design meant that you only get half of the front of the design, so you can’t read it properly. The back half was still fine, but it doesn’t say which day you should come on (it’s for use for today only).
I got given this on Monday morning, and was back there again yesterday walking the dog, but this time saw no sign of anyone giving out passes.