Pollyfilla will slump and crack something rotten in a hole that size.
Check what dust mitigation is in your RAMS, especially if you think there could be something nasty.
Ha. The first proper H&S advice!
There will be the work vacuum to pick up the dust. I have no idea what they are testing for. I will be asking though.
It won't be asbestos though as I have the official reports for that.
@Bobbo started
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Pollyfilla will slump and crack something rotten in a hole that size.
Check what dust mitigation is in your RAMS, especially if you think there could be something nasty.