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used a lot of these for getting floorboards (relatively) level:
https://www.screwfix.com/p/broadfix-plastic-flat-shims-assorted-60-pcs/798KJ?kpid=798KJ&ds_rl=1249413&gclid=CjwKCAjwg-GjBhBnEiwAMUvNW2SgR99ithfkGsB2_PWCTcZXNiPoDXsSJFoVhM6V52pY1yyXjS8nwBoC5MoQAvD_BwE&gclsrc=aw.dsmore work - but could take up the boards and then use 18mm (maybe 25mm even) marine ply atop the joists.
I'm laying a new ply subfloor for lino in our bathroom, the floorboards underneath are pretty lumpy and the 2mm ply I'm taking up is flexing over the voids. Is there any clever stuff I can use between the ply and the floorboards to fill the voids, some of which are up to 5mm? Or would I just be better off with thicker ply instead that can span the gaps with less flex?