Geoff writes

One thing might be a problem and that's weeds in the original grass but
localised application of weed killer with a stick type applicator should
solve it.

Or even glyphosating the whole lot and save the hassle of spot application
Kay

WHAT!!! He'd have to take up the overlying turves first - it has already
been turved - or are you sugesting . . . . . . . ? No, you can't be!

Oh right - it's already been done, has it? I obviously wasn't paying
sufficient attention :-)

Still, if it were left to me ... ;-)
--
Kay