Burger King in Barnet

Normally I don't buy food from BK due to a previous poor experience but I was late getting home and hungry. It was around 8:30pm and I was in a bit of a rush for a train at London Waterloo. When I got to the outlet I tried to use the on screen purchasing system. After trying 3 screens another customer told me they weren't working. On ordering at the counter I was then told they were accepting cash only, which I had. At this point I started to wonder why there were so many people waiting for food as the shelves behind the counter were full. It soon became apparent. There was one person taking orders and one person serving. Two members of staff were on their phone and another member was arguing with the person taking orders. When I received my order after a 5 minute wait I had to ask for the drink to be changed to the correct drink. This was done by the member of staff along with a "for F***s sake" from them. I took my food and went for my train. On sitting down I immediately discovered that the burger I had received was cold. Obviously the food in the racks had been mass produced in advance and they don't expect complaints as people will have left for trains. The service was poor, rude and lacking in any form of customer service. The food was also rubbish. I would severly recommend avoiding this outlet at all costs.