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squeaky floorboards repair

I have a house with a 1 bedroom flat below. the floorboards have become squeaky to the point that it's causing disruption to sleep. Looking to see if someone can help ASAP. There's good access from below , but not all is accessible from below. Upstairs is tenanted and carpeted, so looking at possibility of screw through to lock boards to joists as per the below link --- and that tool is available locally at Mitre 10 --- / --- ?gclid=CjwKCAjw7--KBhAMEiwAxfpkWDvA925nZuyPlo_u9pFF-5_3bb5Gg9Dz- --- EQAvD_BwE&gclsrc=aw.ds