Thanks both!
Despite a shaky start I now seem to have lots and lots of milk. Have been making cheese and giving some to friends but still lots left so I am about to venture into butter making. Might order one of those separator/churn devices from Ukraine. Fun 
Cream separator - brilliant. We use ours regularly and I make lots of icecream in the autumn (preferably when I have some pigs to drink up the skimmed milk). We have found it works best with a maximum of 10litres of milk, any more and it tends to clog up. Much less than that and not worth doing, but I save milk up for it over maybe two/three days. (I do have 7 milkers though).
I have made butter in the past too, but my family finds it a bit "goaty", so now I concentrate on icecream.
I don't pasteurise my milk or cream.