Is this another scam or genuine?

Yesterday afternoon my son (17) answered the door - according to his description it was a woman in her 40's with blond dyed hair and fake tan asking to check our insulation. She was wearing a badge but he did not read what was on it. He told her his dad was away and she replied she'd come back another day.
I was upstairs (in bed due to illness) hearing this but went downstairs when she left - the car she was driving was a silver or grey smaller type car, possibly a Renault, VW Golf or a Suzuki - the car was too far away for me get a reg no.

If I had answered the door I would not have let her in anyway as I read somewhere about someone else had a man visit and he let them in to check the insulation and it wasn't legit.

We're on a farm not far from Wick. Any one else get a visit like this?