London Colney were knocked out of the FA Cup in the first qualifying round after a 1-0 defeat at Brentwood Town on Saturday.
The Blueboys suffered a setback when they were reduced to ten men in the second half after Dan Power received a second yellow card.
Brentwood took advantage of this and netted the winner when Courtney White swept home an effort from close range.
London Colney Reserves lost 4-3 at home to Buckingham Athletic despite goals from Ronnie Blagdon, Josh Galloway and Archie McClelland.
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