Hi, we are CounterfeitGBP, a British run counterfeiting group. We only make one type of note, the £20 note. Why is that? Well:
The £20 note has a high value (around $31 USD or €28 EUR).
It is easier to make one note, we have perfected the art of making these notes.
The £20 note doesn’t have a high enough value to be scrutinised by the average shop worker.
The £5 and £10 notes have lower profit margins for us and you.
A £20 can be used to buy a small amount of stuff, a chocolate bar etc and be changed into genuine money.
There aren’t any other genuine vendors of GBP from the UK (that I have come across).