My wife wants me to ask you good folks a question.
She has a type tray in which she keeps small trinkets from our travels.
One of her favorite small things is the machines that take $0.50 and a penny and then squish the penny and adds a design. Its a little, inexpensive memento that she can easily display in the type tray and is easy to carry.
A friend just recently returned from 2 weeks hiking in Scotland and said she saw these machines occasionally but never used it. My wife wants to know what coins they usually take so we can always have some handy for our trip in June.
I would guess they would use the UK equivalent and use 1p and 20p coins.