Cavity wall insulation suitability survey

[Gill]

I'm looking for independent advice on CWI suitability. 

 

When our underfloor insulation was put in, the installer had a look at cavities with a scope, took some photos, though it looked clear and rubble free and recommend we get someone out to do a proper assessment.  A company we'd had a few recommends from came, drilled a couple of holes and could not determine if we had cavity walls. They then sent a quote to carry out CWI 🙄

 

Time to revisit this. I'm not sure about suitability for our place. Quite exposed bungalow west coast Scotland, brickwork isn't rendered, no mains drainage. 

 

Any advise on what service I'm looking for? Damp surveyor or is this some specialist survey. I'm drawing a blank on this. Thanks 

Edited January 20 by Gill