BW252, you asked about details of his unit and his death. Thanks to Imber's link you now have his cause of death. This accords with his listing on page 6 of War Office Casualty Report 1548 dated 11 Sept 1944, reproduced below. I doubt if the unit war diary will provide any additional details, but you can find it here:
https://discovery.nationalarchives.gov.uk/details/r/C961422 Unfortunately it's not been digitized so you would either need to visit TNA or ask someone to make a copy for you.
His unit was 9 Air Formation Signals - that was a regimental sized unit which consisted of the following component parts:
2 Line Troops
2 Construction Troops
2 Terminal Equipment Troops
3 Telegraph Operating Troops
2 Despatch Rider Troops
1 Technical Maintenance Troop
5 Wing Troops
There were 8 Air Formation Signals units in Italy in 1943/44: 1,2,4,6,7,8,9,10 AFS but unfortunately I can't tell you which RAF Group 9 AFS was attached to. The Air Formation Signals were responsible for the ground communications for the RAF group they supported (within and between their airfields) as well as providing links back to their superior Headquarters (RAF and Army) within the theatre of operations, as well as back the UK. The RAF were responsible for their own tactical comms between their planes and their ops rooms. At the start of the war there were only 3 Air Formation Signals units, all TA, but this number was hastily increased during the first two years of the war, and by 1945 there were up to 17 or 18 of them dotted around the world.