I would take it to Screwfix. Most of these shower tray wastes are the same size.

Thank you, for the helpful comments, the reason I need “like
for like” is because the bottom chamber of the trap I need to leave attached to
the shower tray, it’s just the “inner” damaged hair catcher and cover cap I need
to replace, unfortunately the previous owner had a new shower installed “not on
a plinth for accsses” then committed the cardinal sin of covering the bathroom
floor with 18 mill plywood on top of floor boards, then a 12 mill ceramic tile,
bedded on 10/12 mill of adhesive, so should I need to remove the shower trap
chamber and fit a new one, I will need to break up at least two tiles to get
accsses, hence the need to identify the make of this particular trap to “butcher”
the inner sections from it to suit, hope this makes sense and so annoying when in
past years of fitting bathrooms I have always made sure the next person following
me can gain easy accsses to any plumbing work I have carried out.