A British Five Pound note (Chief Cashier G.M. Gill - Series D - blue - serial prefix RH) uncirculated and in absolute mint condition could fetch anything up to £25 GBP. If it has been circulated but still in good condition, it might fetch anything up to £10 GBP.
A reputable coin dealer will be able to give a more accurate valuation.
You do not specify the Chief Cashier or the type of One Pound note. A Bank of England One Pound note beginning with Serial 37J could have been - 1934 - Chief Cashier K.O. Peppiatt - Series A green - Britannia on the front and the Bank of England building on the reverse. 1960 - Chief Cashier L.K. O'Brien - Series C green - QEII on the front and Britannia on the reverse. 197? - Chief Cashier J.B. Page - Series D green - QEII on the front and Isaac Newton on the reverse.
The Series "B" Bank of England (blue) Five Pound note was demonetised in 1967. The Series "C" Bank of England (blue) Five Pound note was demonetised in 1973. The Series "D" Bank of England (blue) Five Pound note was demonetised in 1991.
A Bank of England One Pound note (Series C - green)(serial W50A - Chief Cashier J B Page), uncirculated and in absolute mint condition could fetch anything up to £5 GBP. If it has been circulated but still in good condition, it might fetch anything up to £3 GBP. Alternatively, they are worth £1 GBP if returned to the Bank of England. 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 Five Pound note (Series D - blue)(Chief Cashier J.B. Page - serial 02N), uncirculated and in absolute mint condition could fetch anything from £5 up to £30 GBP. If it has been circulated but still in good condition, it might fetch anything from £8 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 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.
These notes are potentially still in circulation so, unless they are Uncirculated and in absolute mint condition, they are worth Ten Pounds. A Bank of England Ten Pound note (Series E - orange)(Chief Cashier Merlyn Lowther - serial BJ01), uncirculated and in absolute mint condition could fetch anything up to £20 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England One Pound note (Series D - green)(Chief Cashier J.B. Page - serial 54X) uncirculated and in absolute mint condition could fetch anything up to £5 GBP. If it has been circulated but still in good condition, it might fetch anything up to £3 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.
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 1975 Ten Pound note (Series D - brown)(Chief Cashier J.B. Page - serial B56), uncirculated and in absolute mint condition could fetch anything up to £40 GBP. If it has been circulated but still in good condition, it might fetch anything up to £25 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.