This title became incorporated in War Picture Library on Dec 21st 1970.
Note: a collection of issues #1-60 sold on eBay UK in Dec 2009 for £156.
I'd recommend Wings of Death, a 'trade paperback' collection of great Air Ace stories, available on eBay for a tenner.
Also some nice original cover art has been surfacing in eBay UK in recent times at prices from around £150 to £200. Lovely!
Note: some PR issues may have no value. Selected issues in FN, VF or VF/NM may not exist in some titles.