Armitage played a key role in that win which was made all the more impressive by the absence of a number of senior figures but he has not featured as much as he would have liked because of a hamstring injury.
One of the main reasons why the 21-year-old returned to the Madejski Stadium from Toulon was to increase his game time on the pitch but after a run of five straight matches, he picked up the injury in November.
Since then, he briefly appeared off the bench against Harlequins in late December before taking to the field against Mont-de-Marsan, and he's now determined to make an impression as Irish look to climb clear of danger.
"The mood around the club this week is so much better, everyone is looking forward to training and to playing at the weekend," said Armitage.
"It was great to keep that winning run going in France, French teams never like to lose at home and the conditions were very difficult so it was a very important result for us.
"It builds on the win against Gloucester and we want to keep that momentum going for as long as possible.
"It has been very frustrating not being able to play and being out injured. Especially after it was a run of five straight games - I think that's the most that I've played in a row since school.
"And that's what I really need most at the moment, game time and being out there on the pitch and now I'm fit again that's what I want to achieve."
Irish's victory at Kingsholm saw them pull five points clear of Sale Sharks at the foot of the table but while the Exiles improved their position before the European break, they remain a far cry from the side that Armitage left in the summer.
But while Armitage, who returned to Irish for the remainder of the season from Toulon in September, doesn't know what his long-term future holds, he's determined to help the Exiles out of trouble.
"It's all a bit up in the air at the moment and in the long-term, playing in France is something that definitely appeals to me," he added.
"But for the short-term I want to play as many games as possible for London Irish and help them get up the table. That has to be the most important thing at the moment."
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