thanks again x

At www.sungreen.co.uk/Broadwell/Wynols-Hill.htm there is a photograph of some of the prisoners, and of the associated Marconi Memorial that hasn't survived.

The narrative at www.radiomarconi.com/marconi/aaa4.html suggests that the prisoners would have been brought by train through Lydney, that they were reasonably popular with local people, and that quite a few settled locally after the war.

At www.nationalarchives.gov.uk/catalogue/rdleaflet.asp?sLeafletID=78&j=1#7, paragraph 7.1, it says that alphabetical and numerical indexes of Italian Prisoners of War were sent to the Italian Red Cross. It goes on to say that those records were then dispersed, but it also gives an address where you might pursue your enquiry.