Chief executive Robin Rowland said: "The Westfield opening has been absolutely astounding. To get a 35 per cent return on our investment, we would have to do £18,000 a week. It's very early days, but it looks like it could return 100per cent in the first year, so I'm very happy." Simon Holberton, spokesman for Westfield, said: "We have exceeded expectations and are delighted with the level of trading. Food has been doing very well, and we've been selling well across the board.