Self checkout staff at tesco are like the wee cashier at the tills just doing there jobs to get customers in and out the shop as quickly as possible.
You do unfortunately get staff at some tesco store on self checkouts being awkward towards customers and this isn't suppose to happen ok, they meant to be polite and helpful like the cashier at the tills would be.
Staff in lidi and poundland are very pushy and sometimes cheeky when you try to go to a cash desk they are pushing you towards the self checkouts instead, see point if the shop very busy etc then ask customers to goto the self checkouts but they don't. Cristise tesco but they not the only supermarket and shop to make customers use the self checkouts okay. It should be whatever the customers preference is ok.