Highly collectible Holiday Special. They turn up on E Bay every so often and always attract a lot of bidding interest. For example, back in Feb 2010 a VG /FN copy fetched £43.50 with 15 bids. It had noticeable crease along the spine and bottom area of the cover.
See TV Action and Countdown Holiday Special for the next one (1972) which becomes TV Action Holiday Special 1973.
Note: some PR issues may have no value. Selected issues in FN, VF or VF/NM may not exist in some titles.