Mettam opened the scoring from a contentious penalty two minutes before half-time and Stamp struck two minutes after Nathan Stainfield
had headed an equaliser on the hour mark.
Stainfield was denied a second goal by a terrific Jason White save on the stroke of full-time, as a full-blooded local derby ended in favour of the play-off chasing visitors.
Trinity, roared on by 144 travelling supporters in the away end, carried the greater threat during the first half.
, back in the side after illness, made an excellent save to deny Stamp early on — but only after his own poor clearance had put the Trinity frontman in the clear. Ryan Williams shovelled the rebound well wide.
Jamie Yates — the pantomime villain of the piece in United fans’ eyes — blazed an effort marginally wide, while Bastock saved well at the feet of hotshot Ryan Kendall.
Bastock made a sprawling save to deny Shane Clarke, while Stamp rattled the crossbar with a hooked effort following a Dominic Roma cross.
had United’s first real chance when he blasted wide following a neat Boston move.
Referee Matthew Buonassisi, who missed the infamous Rory Coleman handball against Gloucester City last season under his previous name of McLaughlin, awarded the visitors a spot-kick two minutes before half-time.
was adjudged to have fouled Clarke and METTAM
, who was on for the injured Kendall, sent Bastock the wrong way from 12 yards.
United were a different proposition after the break and White made an excellent save to keep out Milnes’ 25-yard dipper.
Stainfield then headed wide, while Ross’ 20-yarder deflected off target, but the duo soon combined to draw United level. Ross supplied the corner delivery and STAINFIELD
flashed a header past White from close-range.
Parity was short-lived though. Williams pinged a brilliant crossfield ball into the path of STAMP
, who looped an excellent header beyond the grasp of Bastock.
Mettam was close to a third for Trinity, but he blasted wide, and the Pilgrims gradually stepped up their offensive in the closing stages.
Substitute Jason Lee
looped a header against the crossbar following Ryan Semple
’s cross, while Ross’ curling free-kick was only a fraction wide.
United came even closer when White produced a magnificent save, high to his left, to keep out Stainfield’s goalbound header, while Lee headed narrowly wide following a Kevin Austin
cross as time ran out and the points headed to the north of the county.
Boston (4-3-3): Paul Bastock
; Lee Canoville
, Tom Ward
, Nathan Stainfield
, Gareth Jelleyman
46); Ben Milnes
, Ian Ross
, Josh Burge
63); Ben Fairclough
46), Spencer Weir-Daley
, Marc Newsham
. Subs (not used): Conor Marshall
, James Reed
Jason White, Dominic Roma, Luke Waterfall, Andrew Boyce, Kevin Sandwith; Ryan Williams (Michael Leary 83), Shane Clarke, Jonathan D’Laryea, Jamie Yates; Darryn Stamp (Paul Connor 88), Ryan Kendall (Leon Mettam 27). Subs (not used): Adam Watts, Ryan Paczkowski.