They were sent to me a few years back by my pal in Scotland (Jack Hesketh).
So what are they? A nice set of four "Stampers Booklets" containing panes of Machins 10 x 1st-class flame NV. They were first issued as a set on 20th Sep 1994.
All four booklets were printed by Walsall Security Printers Ltd and originally sold at £2.50p per book.
The panes contained stamps overprinted with 2 x A - yellow phosphor bars (short wave).
Known to specialist booklet collectors as as "Stampers, Padlock books or if you want to be pedantic Type 7 (5) books. Each had the same barcode 100197.
Number 1 "Padlock"
Number 2 "Keep in touch"
Number 3 "Happy Birthday "
Number 4 "What’s happenin?"
Many thanks Jack. Without checking I have no idea what todays catalogue value is but they have now been mounted and take pride of place. I might add , they look terrific when mounted.