A Bank of England 1940? Ten Shilling note (Series A - red/brown)(Chief Cashier K.O. Peppiatt - serial E53D), uncirculated and in absolute mint condition could fetch anything up to £65 GBP. If it has been circulated but still in good condition, it might fetch anything from £20 to £34 GBP.
A reputable coin dealer will be able to give a more accurate valuation.
If your Ten Shilling note has Queen Elizabeth II on the obverse and a large image of a seated left facing Britannia on the reverse, a serial number commencing with S74 would be Chief Cashier J.Q. Hollom, possibly printed in 1963.
A Bank of England 194? Ten Shilling note (Series A - red/brown)(Chief Cashier K.O. Peppiatt - serial J19D), uncirculated and in absolute mint condition could fetch anything up to £80 GBP. If it has been circulated but still in good condition, it might fetch anything from £30 to £65 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England Ten Shilling note (Series A - red/brown)(Chief Cashier K O Peppiatt - serial 08I), uncirculated and in absolute mint condition could fetch anything up to £170 GBP. If it has been circulated but still in good condition, it might fetch anything from £30 to £70 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England 1940? Ten Shilling note (Series A - red/brown)(Chief Cashier K. O. Peppiatt - serial J64D), uncirculated and in absolute mint condition could fetch anything up to £65 GBP. If it has been circulated but still in good condition, it might fetch anything from £20 to £34 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England Ten Shilling note (Series A - red/brown)(K. O. Peppiatt - serial N79D), uncirculated and in absolute mint condition could fetch anything up to £65 GBP. If it has been circulated but still in good condition, it might fetch anything from £20 to £34 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England Ten Shilling note (Wartime emergency issue)(Series A - mauve)(Chief Cashier K.O. Peppiatt - serial Y81E), uncirculated and in absolute mint condition could fetch up to £80 GBP. If it has been circulated but still in good condition, it might fetch anything from £30 to £65 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England Ten Shilling note (Series A - mauve - Wartime emergency issue)(Chief Cashier - K O Peppiatt), uncirculated and in absolute mint condition could fetch anything up to £65 GBP. If it has been circulated but still in good condition, it might fetch anything from £20 to £34 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England Ten Shilling note (Series A - mauve)(Chief Cashier K O Peppiatt - serial L19D), uncirculated and in absolute mint condition could fetch anything up to £65 GBP. If it has been circulated but still in good condition, it might fetch anything from £20 to £34 GBP. A reputable coin dealer will be able to give a more accurate valuation.
Please check the serial number and provide the name of the Chief Cashier if possible.
A Bank of England 1948(?) One Pound note (Series A - green)(Chief Cashier K.O. Peppiatt - serial T81A), circulated but still in good condition, might fetch anything from £4 to £25 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England One Pound note (Series A - green)(Chief Cashier K.O. Peppiatt - serial J84A), uncirculated and in absolute mint condition could fetch anything from £5 up to £60 GBP. If it has been circulated but still in good condition, it might fetch anything from £15 to £35 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England One Pound note (Series A - green)(Chief Cashier K.O. Peppiatt - serial Z29D) uncirculated and in absolute mint condition could fetch anything up to £45 GBP. If it has been circulated but still in good condition, it might fetch anything from £3 to £25 GBP. A reputable coin dealer will be able to give a more accurate valuation.