Checkers Brackenhurst - staff get preference at tills

I find that when I go shopping at around their teatime in the morning, staff members seem to get preference over customers waiting in the queue at the cashiers. I have complained to the supervisor about this practice but it just seems to continue. Just this morning I was second in line at the cashier. When the customer was finished served, instead of me being next, two staff members were first helped. They just jumped the queue by coming from the other side. This also seemed quite normal practice and there was not even an apology or comment. Also the staff get quite chatty with each other while being served which is even more irritating. I would suggest that the store put up a notice stating that staff members can potentially get helped first due to time constraints or whatever. This will be a great help to the public so that I know what to expect and possibly go shop somewhere else