I think image no. 1 may be SG5 - catalogue value ~50 pounds; image 2 is SG6 - ~60 pounds; image 3 - SG56(?) (although I'd second comments above re forgeries) - value <10 pounds.
"Seems to me that cheep stamps rarely get forged!"
That is a common misconception among many collectors. Individual inexpensive stamps don't often get forged, but inexpensive stamps that are part of a set with some expensive values have often been forged. That way a forger can sell a complete set where all the overprints or surcharges match; collectors will often think it must be a good set because they think that "cheap stamps rarely get forged". What's more, many forgeries were done decades ago so they might well look the proper age.
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