I had a guy get so confused one day with a £20 NI note he shorted me £10 on the change. He was apologetic admitting he didn't know what I'd handed him but as a

I had a guy get so confused one day with a £20 NI note he shorted me £10 on the change. He was apologetic admitting he didn't know what I'd handed him but as a was a regular customer he didn't think I'd give him a fake.