Well....
I only had to visit 3 shops to get my Ukash. It's not exactly in the nicest of locations so it is definitely a day-time walk only. However, with my small piece of til receipt, I walked away thinking is this for real? Have I just lost £25? Fear not... It worked.
To put your minds at rest, this is what a Ukash receipt looks like over here. (Postcode and refernce blanked out for obvious reasons.)
