The Atom Men led 1-0 through Kai Parton-Edey after 10 minutes but the Yellamen equalised five minutes later from the penalty spot.
That was the last time United were to get on the score sheet though with Parton-Edey scoring his second on 25 minutes and completing his hat-trick on 79 minutes.
Nathanael Robinson and Danny Horscroft got the goals for the Kestrels while in West Berkshire Brimpton were 6-3 winners over Berks County.
Pre season results
- AFC Aldermaston 3-1 Ascot United
- Almondsbury UWE 4-2 Woodley United
- Brimpton 6-3 Berks County
- Sandhurst Town 2-1 Ash United
Results and updates for the Larges Lane pre season cup will follow along with fixtures for the two Sunday matches.