In the end the League Two side could manage only a 3-1 triumph against Newcastle with goals from Stacy Long, Michael Bostwick and Peter Winn.
But it was enough to consign Newcastle to their most humiliating Cup defeat since they were beaten famously by non-league Hereford United in 1972.
Westley put it down partly to the psychology of a confidence-boosting team talk and said: "The focus before the game was how we would win 5-0. We established that if we did just 20% of what it would take to win 5-0 we would still win the game.
"Our game plan was to get to five. Three wasn't five but it was a decent result.
"You only ever win by being positive. We played to our strengths and their weaknesses. The top players are not infallible, they all have their weaknesses and winning is about exposing their weaknesses and playing to your strengths and we did that."
Source: PA
Source: PA