Thank you both. I have contacted the SADF and the SAAF before, and they could not help me. So I know he is a 2nd Lt, in the South African Army, who flew with the RAF. I thought I could trace him via the RAF but to no avail. I thought I might see which battalions flew with the RAF but I think this is rather a needle in a haystack. The man in the second photo, I have been advised that he could be from the 6th South African Armoured Division who were in Portofino,Italy. But without another photograph I can't state who is for sure. The only Lehmann listed in the Roll of Honour , was a private R.W.Lehmann , First City Cape Town Highlanders, who died at age 25 on 16-5-1945. I found this information in the book by James Bourhilll 'Come back to Portofino.'
James tells me this cannot be my Mr Lehmann. I have one more clue - a birth certificate states he was born in London or New York and he was 24 in 1944.