This title seems to be pretty common on E Bay, even number ones as it happens. Free gift issue #1 was plastic Vampire Fangs and adds maybe £3-£5 to the value. Holiday Specials ran from 1977 to 1983 and are plentiful. Maybe the last one from 1983 is scarcer.
The annuals ran from 1978 to 1985, well beyond the demise of the comic. Plentiful, all dated on cover, all turn up in high grade very frequently. They can fetch some money though. A 1982 in nice shape sold for £13.50 on eBay UK in Feb 2008. A complete run of the comic bar issue #6 sold for £83.77 on eBay UK in Feb 2008.
Note: some PR issues may have no value. Selected issues in FN, VF or VF/NM may not exist in some titles.