My crank has movement

Hi, I'm in need of help regarding my crank.
Yesterday on a training cycle I noticed that at the bottom of every rotation on the right pedal there was a loud click noise, no matter what gear or speed, always at the bottom of the roation. Found no movement in the pedals which are new anyway but the crank itself has a couple of mm's of movement.
So what could the problem be & how do I fix it?
Specialist tools?
My bike is a Carrera Titan, £300 jobby, about 14 months old now & done a fair few miles but I need it fixed as I'm taking part on Maggies Bike & Hike in under 3 weeks.
Yesterday on a training cycle I noticed that at the bottom of every rotation on the right pedal there was a loud click noise, no matter what gear or speed, always at the bottom of the roation. Found no movement in the pedals which are new anyway but the crank itself has a couple of mm's of movement.
So what could the problem be & how do I fix it?
Specialist tools?
My bike is a Carrera Titan, £300 jobby, about 14 months old now & done a fair few miles but I need it fixed as I'm taking part on Maggies Bike & Hike in under 3 weeks.
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Posts
Might just go all out & bang in a new crank if the bearings are done.
Carbon 456
456 lefty
Pompino
White Inbred