This one has me puzzled, and I've seen a lot of Fiberglas kitcars.
The Arkley does not have running boards or cowl (scuttle) vets, but does have a recess for the spare on the boot.
This ALMOST looks like a mix of several kits.
The grille is too wide for any of the "normal" MG-type kits.
The one-piece running board and fenders looks Manx-ish, as in dune-buggy.
I am puzzled about the big chicken-leg shaped cutout to the right of where the instruments would go if it had ever been completed.
I am guessing there was another part that fit over the snout of the bonnet.
With he opening behind the rear "seat", and the low horizontal flange alongside the inner bulkheads, next to where the front seats would have gone, smacks of VW pan mount.
I am thinking this was made for a VW chassis, somebody slapped their rotted MG bits under it, probably with a home-cobbled frame, maybe used another bonnet (to clear the bigger radiator?), then gave up.
The big "bustle-back" boot REALLY smacks of rear-mount VW air-cooled...
The top bows are also something one saw on cheap dune-buggy kits.
Not very sturdy.