The Pilgrims journeyed to King George V Sports Hub to tackle the high-flying Cestrians.
United secured a 1-0 win through Sam Finch's late goal – with the substitute having only been on the pitch for two minutes at the time.
Boston: Austin Barker, Dexter Tomlinson (Will Pettitt 65), Sean Bray-Smith (Elod Nadasdi 85), Kirils Snikeris, Charlie Brooks, Josh Panton, Denis Matei (Oliver Houlston 46), Jake Thompson, Rhys Smaller, Toby Cotton (Sam Finch 78), Rueben Fogg. Sub (not used): Daniel Bridges.
Referee: Shaun Mohan.