A British 196? One Pound note (Series C - green)(Chief Cashier J.S. Fforde - serial N51D), uncirculated and in absolute mint condition could fetch anything up to £6 GBP. If it has been circulated but still in good condition, it might fetch anything up to £4 GBP.
A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England One Pound note (Series C - green)(Chief Cashier J.S. Fforde - serial S54L), uncirculated and in absolute mint condition could fetch anything up to £6 GBP. If it has been circulated but still in good condition, it might fetch anything up to £4 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England One Pound note (Series C - green)(Chief Cashier J.S. Fforde - serial N34B), uncirculated and in absolute mint condition could fetch anything up to £6 GBP. If it has been circulated but still in good condition, it might fetch anything up to £4 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England One Pound note (Series C - green)(Chief Cashier J.S. Fforde - serial R46L), uncirculated and in absolute mint condition could fetch anything up to £10 GBP. If it has been circulated but still in good condition, it might fetch anything up to £5 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England Ten Pound note (Series C - brown)(Chief Cashier J S Fforde - serial A65), uncirculated and in absolute mint condition could fetch anything up to £50 GBP. If it has been circulated but still in good condition, it might fetch anything up to £30 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England 196? Five Pound note (Series C - blue)(Chief Cashier J.S. Fforde - serial Z93), uncirculated and in absolute mint condition could fetch anything up to £35 GBP. If it has been circulated but still in good condition, it might fetch anything up to £15 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England One Pound note (Series C - green)(Chief Cashier J. S. Fforde - Serial E45Y), uncirculated and in absolute mint condition could fetch anything up to £10 GBP. If it has been circulated but still in good condition, it might fetch anything from £2 to £4 GBP. The "C" on the reverse is actually a "G" indicating that the note was printed on a "Goebel" machine. A reputable coin dealer will be able to give a more accurate valuation.
The Bank of England One Pound note was demonetised in 1988.
No, it is different. Spain uses the Euro (€; code: EUR) whereas England (and all of the United Kingdom) uses the british Pound (GBP, represented by the pound sign £). The term originated in England as the value of a pound of silver.
The value of the pound is the same in England, Scotland, Wales and Northern Ireland although notes issued by Scottish and Northern Ireland banks aren't widely accepted by shops in England and Wales. The Republic of Ireland uses the Euro.
A Bank of England One Pound note (Series C - green)(Chief Cashier - J S Fforde - serial N09E), uncirculated and in absolute mint condition could fetch anything up to £6 GBP. If it has been circulated but still in good condition, it might fetch anything up to £4 GBP. A range of 8 consecutive uncirculated banknotes are likely to attract a higher value. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England 1967 Ten Shilling note (Series C - red/brown)(Chief Cashier J.S. Fforde - serial B96N), uncirculated and in absolute mint condition could fetch anything up to £10 GBP. If it has been circulated, not much. A reputable coin dealer will be able to give a more accurate valuation.
You have not provided a serial number or a place of issue, but you potentially have a note of value.