chimney noise

[davidm1969]

Hi there have got a strange noise intermittently coming from wall - there's a vent and looks like an old chimney breast [mid floor flat; also heard in basement flat]. Since Sunday 28th so for 3 days

video here chimney noise

Any thoughts/ideas what this could be?

It's not scratching so doesnt sound like it would be any sort of animals [mice or birds]. Given it's been going on for 3 days - I'm not sure what if anything could be falling and making that sort of noise

What would be best way to investigate - do modern chimney sweeps use cameras to look from top of a chimney stack?

thanks for all the expert advice [i hope] in anticipation

Best

 

[jj4091]

do modern chimney sweeps use cameras to look from top of a chimney stack?

Yes I would think so. Or someone who instals flue liners for wood burners