Re Davidson - the British glass manufacturer .............. I was looking for evidence to support some sort of date line for the use of your 'Made in England', and found some information in the Stewart's book which indicated the use of this statement in the very early 1930's - which incidentally we in the U.K. don't view as 'retro period'. Retro, I believe, implies the middle of the C20, usually. Sorry, don't know where you are by the way.
Anyway, the info I was reading concerned Davidson taking over the U.K. manufacture of 'Chippendale', which had formerly been made in the States - a change of location which came about, apparently, due to the British Goverment trying to protect British manufacturers against cheap imports - to which end they imposed a 50% import duty of foreign imported glass.
The point of all this was that when Davidson advertised 'Chippendale', they did so as being 'British made' - although at the same time the glass products were provided with stickers which read.......'Made in England' etc.
Who would have made your metal tray I've no idea, and it will almost cerainly remain 'a nony mouse'. But anyway s/s should be easily identifiable as opposed to EPNS or similar.