After the 1955 Cup Final, Ashington-born hero Jackie Milburn brought the Cup back to his home town to show locally. The police locked the Cup in a cell overnight for safe-keeping. The boy in the story visits the cell to see the Cup and is lifted up to sit in it briefly. This incident is a retelling of an actual experience the author enjoyed.
See bookmark p.112 for more on Jackie Milburn and the FA Cup Final, including footage of his goal.
And here's a little more to enjoy of Jackie, the 1955 Final, and the lifting of that famous Cup.