The Shots should have opened the scoring after 20 minutes when Michael Ingham could only parry Danny Hylton’s shot to Craig Reid but the striker could only hit a post from two yards.
Jamie Young made an outstanding save to stop Chris Smith’s diving header two minutes later. Ashley Chambers then combined with Walker to set up Blair in the 41st minute, but Young’s heroics continued as the first half ended goalless.
However it took the Minstermen less than three minutes to open the scoring after the restart when Aldershot lost possession near the halfway line and an incisive passing move saw Walker release Blair, who kept his cool to beat Young.
Walker scored the second from the penalty spot in the 51st minute after he was tripped by Sonny Bradley, who wasted several opportunities to clear his lines.
Substitute Alex Rodman had Aldershot’s best chance to reduce the arrears but he blazed over with only Ingham to beat.
Cristiano Ronaldo, Gareth Bale and Karim Benzema were on the scoresheet as a Real Madrid side shorn of several stars continued their impressive form with a 4-0
Derek Adams' Plymouth Argyle extended their League One winning streak to six games with a hard-fought 1-0 home win over play-off chasing rivals Bradford City, w
Port Vale manager Neil Aspin felt his side did not do enough to open up Newport as the sides played out a goalless draw at Vale Park in Sky Bet League Two.
Forest Green manager Mark Cooper has challenged hot-shot striker Christian Doidge to hit 30 goals this season and help keep Rovers in League Two.
Peterborough manager Grant McCann insisted his side's season was still well and truly alive - despite seeing them held to a fourth-successive draw.
Barnet manager Graham Westley was full of praise for his players after they won 1-0 at Colchester United to boost their survival hopes.
St Johnstone manager Tommy Wright praised Murray Davidson for leading from the front after the midfielder's double ended a five-month wait for a home win.