Stucked pigeons between bridge and the fences under the bridge

Hello,

I am new in rspb forum and also new in UK. We see pigeons under bridge and between bridge/fence. They are stucked and a few of them are probably dead. The bridge is on the left side of the Leamington Spa train station on 1 Lower Ave, Leamington Spa. How can we make open the fence and set alive ones free and be removed the dead ones? Are there any wild bird charity orantrhüng who they can help them?