Thank you Roy and Mowsehowse
Yes I have found GenTeam a very useful resource, I have found important leads through it - ie one yesterday with a marriage between Ernst Friedmann and Lizzi Weiss in 1933, I'm now looking for the actual register entry on Family Search, but I think it might not be accessible on line. I looked through the book for 1932-34 at various synagogues in districts I and II, but the Schiffschule marriages for 1933 were missing, they must be in another book which seems to be only on microfiche or locked.
I also found Miksa's marriage and divorce on GenTeam a while back, then found the register entries in the same way, as they were registered under the same synagogue, Schiffschule in district II. But this is the last time that I can find Miksa in any records. I know that Margit went to New York in 1936 and died there in 1976. But I have no idea where Miksa went after that. He didn't go back to live with his young daughter in Budapest (she was born in 1914) who was being brought up by her grandparents (her mother, Miksa's 2nd wife, died in the Spanish flu in 1918).
Miksa was born in Budapest, he lived in Debrecen at some point when he married his first wife in 1908 but they divorced soon after. He was in Budapest with his 2nd wife in 1911 who died in 1918 as mentioned above, then married Margit Friedmann his 3rd wife in 1924, divorcing in 1929. He was some sort of electrical engineer. That's all I know about him from the records.
By the way, the names you mention Roy are known relatives. I'm not sure where the 1932 date came from, but I don't think it's correct.
Maybe my best option is to look in the Red Cross ITS tracing service docs, I don't think they're on line but accessible in London at the Weiner Library. Any other ideas of course I'd be very grateful!
Many thanks
Colee