I went to the store on Saturday 9th March, I collected the items i required in my trolley and went to the tills. I asked the very surly assistant if a till was going to open rather than the self service element as I had quite a lot of shopping, I was told NO she hadn't got enough staff to open a till and they had been there since 4a.m. and hadn't had a break yet!! I reluctantly used the self service tills as it was either that or leave my shopping. But when I was almost finished she decided to open a till as there were 2 people waiting even though the self service till in front me was vacant. I said I was obviously not good enough to open a till for. NOT the type of service you expect from M&S. I assume I was not good enough to bother about and if the staff had not had a break perhaps something to discuss with a manager not make that a reason for bad service to a customer!