We had a leaflet of that nature stuck through our door, offering a massive discount but only for the next two weeks whilst they were working in our area.
I did some investigating and traced the phone number to Milton Keynes, some 50 miles from us.
The firm were also charging VAT on their prices so we checked the VAT No. online....No Trace and Not Currently in use !
Suspicions aroused I contacted HMRC who checked their records and found the VAT No. being used had previously been linked to the Tax Office itself in Milton Keynes. They were very interested in the company concerned as they also didn't appear to exist.....certainly not when it came to paying tax and VAT

They would be investigating the company themselves.
What's that saying, "If it looks too good to be true, it probably is " !!
Les