Folks, I'm the other half of this team and while I'm industrious, I am not industrial.
I'm encouraged to read the comments that you have all made and grateful for the advice.
Couple of questions:
1. What are the tell tale signs of asbestos?
I'm inclined towards the outer sheets being asbestos, as I am guessing they were added in the 70s, (could be wrong) when asbestos was the great saviour.
I will be reading
https://asbestosawareness.com.au/asbestos-for-tradies/identifying-asbestos/ for tips on identification.
2. Roof damage
Some of the tin sheets have lifted on the roof, would that be an indication that water has got in or that birds are nesting in the cavity?
My untrained eye, suggests that the general conditioin is pretty good. We are going to have a site visit in a couple of weeks, to get a better look.
But I appreciate you all giving your suggestions.
No stranger to hard work, but I'm English and can whinge for my country