fitheach, 
When in Perth (see previous posts), we visited the Brew Dog pub on George Street. Never again.
Firstly, the default for ordering food is scanning a QR code on the table, and then entering your order via a web app.
Secondly, the pub doesn't accept cash, only credit cards. This only became clear to me when we wanted to pay.
Do they purposely go out of their way to make it difficult for the customers?