Republic of Ireland, Northern Ireland and Wales all secured 2009 European Championship qualifier victories.
John-Joe O'Toole netted an injury-time winner against Bulgaria as Republic of Ireland Under 21s claimed their first win in the 2009 European Championship qualifiers.
The Watford midfielder came off the bench to head home his first goal for his country from a right-wing cross by Eddie Nolan.
Barnet defender Joe O'Cearuill was presented with Ireland's best first-half chance as he blazed over from two yards out.
Bulgaria came close when Vladimir Gadzhev had two thumping efforts in quick succession well saved by UCD keeper Darren Quigley, but O'Toole stole the points for the home side in the final seconds.
Elsewhere, Wales Under 21s recorded a famous victory 4-2 over France; however the feat was somewhat marred by the visitors' decision to complain to Uefa about a broken floodlight.
Brian Flynn's side took the lead through Ched Evans (45), but were pegged back when Yoann Gourcuff (72) and Dimitri Payet (77) netted late in the second half.
An Evans spot-kick and Mark Bradley 82nd minute strike completed the turnaround for Wales, before Evans wrapped up a memorable hat-trick.
The match at Ninian Park had been delayed by 19 minutes due to floodlight failure before the game eventually went ahead with just one of four still not working. The Uefa delegate was happy for the game to go ahead but France have lodged an official protest.
Northern Ireland Under 21s recorded their fourth win in Group Nine with a 3-0 victory over Moldova.
A convincing first-half display ensured Roy Millar's men followed up last Friday's 5-0 thrashing of Luxembourg with another success.
Michael O'Connor opened the scoring at Glenavon's Mourneview Park with a goal in the second minute.
And strikes from Jamie Ward (10) and David Buchanan (13) made sure of all three points to move Northern Ireland that little bit closer to securing their place in the 2009 European Championship play-offs.