Thanks guys. Yes Mike it really is something to see. Living most of my life in the suburbs it was a non-starter to even glimpse the ZL. But up in the bush with only a bit of a light dome from Newcastle bothering me, the ZL is outstanding.
Do have a browse through Brian May's thesis. It is very well written, and in places rather quirky, so you can see what he's up to even if one is not a radial velocity expert!
Richard