That was me

I have been using it for past couple of months and it's been superb.
I'm 99% sure it's a Zircon... the 1% doubt is due to B&Q selling
something of good quality cheap!
As a stud detector this thing works great, it can even detect a change
of density in concrete to a couple inches in depth.

It doesn't have voltage or metal detector but you can get relatively
reliable one of these for not much.