I read "The Guernsey Literary and Potato Peel Pie Society" whilst on Alderney - not much concrete in the book, but The Guernsey Press said it had increased American tourist numbers to Guernsey.

I also dipped into "Festung Alderney" by Trevor Davenport and compared the diagrams to the actual sites I visited when at times the visibility was down to shrouded-under-a-white-cloth distance - not like the sky in this postcard. The book is pretty comprehensive, if rather niche.