Thank you for the input so far.
I did briefly try a 41mm in Sydney and it felt ok. It was a very speedy trial. If it helps, and it probably does not, I had a 38mm Tudor Royal which I sold because it felt too small. That was 38mm x 10.6mm.
I've enclosed a picture of the Daytona and a few Ors if it helps. The Tudor shown here is the 41mm which has a short lug to lug of 47mm.
The downside to living in a country with no AD and being on the South Island when the grey dealers are in the North Island is you can't try before you buy - argh.