So have looked up the Kowa...looks like very similar to the Leica in many ways but the adaptor for it doesn't look straight forward, so the Leica is the front runner in my search.
The Pentax and Hyperion I have dismissed due to lack of AFOV at the long fl end.
It's all academic for now, but give me a few months of saving up and The Leica has it. EOFB reads to be at the long fl end and I have the rather nice, small and lightweight Pan 19mm to cover that, should it be needed, courtesy of Morton who graciously decided to part with his....thanks Morton.
Will update this later on...much later, specially knowing Melboune's track record with weather.
Matt