Tried out the Halfords matt and satin lacquers, and ... they look exactly the same!
Close examination under a strong light shows a VERY slight, almost insignificant difference in the finish.
I've used Halfords matt and satin black sprays quite a lot, and expected these to match. The finish of the lacquers is somewhere between the two.
I will carry on using them as they spray very well, and the finish is actually very good.
Thanks for the advice, I will be checking others out.
Cheers, Dave.