Hard to say, very Helvetica to me but could be HI Chalet or Chalet Book.

Thanks Ryuk. Yes, it is very Helvetica (similar tittles) but at the same time it's fully geometric (look at the uppercase G). It's a hard one!

Agree with Ryuk. Chalet London 1960 for the heads, and probably Chalet Book for the text (it does have a geometric G):
http://www.houseind.com/fonts/chalet

If you can provide the name of the book, I may be able to confirm....

You're both right, I didn't realise Chalet had different versions, some with a double storey 'a'. I had a look at all their specimens and found the specific version I was after: Chalet London 1960.

Thank you both for your help!