Friendly staff but the slowest service I have ever...

Friendly staff but the slowest service I have ever seen (on every occasion I have shopped there). On my most recent trip there were 5 tills and only 2 people ahead of me: it still took 15 minutes to make a purchase. Seems to be due more to their IT system than the staff though (that being said they so seem to take their time no matter how big the que is)