Zac Hardy's first half hat-trick led the way for the Pilgrims, with Will Langford and Toby Cotton also on target for Jamie Raynor's side.

Jack Clarke had briefly equalised for the hosts, but United surged into a 4-1 half-time lead to take a firm stranglehold on the tie.

Boston: Zach Marsh, Finley Hipkin, Oliver Houlston, Jake Thompson (Alex Van-Tam 60), Charlie Brooks, Kirill Snikeris, Toby Cotton (Oliver Callaby 80), Will Langford (Daniel Bridges 70), Will Pettitt, Zac Hardy, Rhys Smaller (Denis Matei 62). Subs (not used): Josh Panton, Elod Nadasdi, Austin Barker (gk).

Referee: George Younger.

Attendance: 93.

PIC: Chris Bray.