Luton Town moved to the top of League Two after substitute Luke Guttridge scored a last-minute winner against Northampton Town.The former Cobblers midfielder pounced in stoppage time, taking Michael Harriman's pass in his path to beat goalkeeper Jordan Archer.A poor match saw little goalmouth action prior to the winner as Town's leading scorer Mark Cullen was denied by a great sliding challenge from Gregor Robertson.Cullen then headed Alex Lawless' ball back across goal over, while Andy Drury's left-footed curler cleared the bar too.Northampton's only real opportunity saw John-Joe O'Toole leap highest and head at Mark Tyler from close range.In the second period, Tyler made a brilliant save when faced by Alex Nicholls one on one, while Guttridge was denied by Archer at his near post after linking well with Cullen.Hatters upped the tempo in the closing stages as Drury saw a number of free kicks either blocked or cleared, before Guttridge pounced to send Kenilworth Road wild with joy.