The 28-year-old, who was an unused substitute in the Golden Jaguars' 2-0 victory over Bermuda at the weekend, emerged as a 72nd minute substitute against Montserrat on Tuesday.
The game ended 0-0 – with ex-Pilgrim Spencer Weir-Daley emerging as a substitute for Montserrat.
Mitford will be back in the United fold ahead of Saturday's National League North trip to Hereford FC.
PIC: Nikolay Hristov.