Ever use these guys?

Well, they're using photos of "work" and "customers" taken from other websites (use reverse image search to see what I mean; if using an Android tab/phone just hold down on an image and select "Search Google for this image").  Their website is simply riddled with spelling and language errors too.

I'd expect a company claiming to be in business for 45 years to also be a registered limited company (easy to verify on solocheck or similar).  And have a more professional website and long-time registered domain, etc.  That sort of website and/or a Facebook page can be put together in no time.

Did "Kevin", the boss, give you his surname? If not, I'd doubt he'd show you his driver's license to let you verify even his first name, frankly.  I once had an "Eddie" turn into a "John" over the course of a few years (definitely the same guy I remembered from before), and another two guys who seemed to get muddled up as to which one was "William" that day (both were pleasant enough to be fair).

The range of services is also, err, "familiar".

Whoever Kevin is, I think "boss" is the key word here danjo. Not an automatic "no no", but just be careful (think insurance, liability, etc.).