Great advice everyone. Thanks.
Wombat - those feed mixes look too complicated - aragonite, alfalfa meal, fishmeal, poultry Nutri-Balancer??!!

lol
Paddy - We also had chickens when I was a kid and we lived in the suburbs. I remember they ate table scraps and all seemed healthy.
(moving to Montenegro)
Seems that if I want to go natural and simple, then giving them plenty of space they'll get worms, insects and berries/etc naturally, then greens from the home plot, veggie table scraps, and egg shells (that's a new one for me), they should do well?
Then possibly see about getting my hands on some grains if not too difficult/expensive.

Interests: land care, organic, permaculture, animal welfare, home education, tea.