GB Old Perfin Stamps

Dear all,
can you tell me if these gb old perfin stamps have some value?
Thanks
Michele

Not much value. Perfins destroy most of the Scotts/Gibbons catalog value of stamps. Some countries [US/Denmark/some others] have robust markets for relatively scarce perfins, GB does not. There are just too many out there and they are not individually rated for scarcity.

The stamps themselves, even if un-perfinned, would have minimal value as they are very common values and the condition of some would make some value-less.
Some very early Queen Victoria perfins are very collectable as the number of companies using them was limited... but grew substantially very quickly.
Perfins such as your HM/SO (Her Majesty's Stationery Office) exist on stamps of many reigns and can be collected to complete the "set".
Some perfin collectors would have a thematic collection... such as Banks... and your MB (Midland Bank Limited) and K (Kleinworts Bank, London) and the H (possibly The Hongkong and Shanghai Bank) would fit that theme.
Not many GB perfinned stamps have any sustantial value but there are dedicated perfin collectors who do it for the fun and there is philatelic value if not financial.