A queue at the bar

Went back into the Coach & Horses in Chepstow, their beer and sausage Festival is in full swing, there may be a queue at th bar but everyone gets served quickly. WTF is it with companies like JD Chaverspoons where they promise to have staff on the bar and you wait for 10 minutes to get served, yet a tenanted pub manages to serve the customers faster? Best beer tonight and hence best beer Festival has been the Coach & Horses.