Five Pounds Somerset QE2 pictorial & The Duke of Wellington B343 L (Lithography) Reverse issues 1980 (7) all LAST series prefixes and some could relate them to the popular military term LZ (Landing Zone) in the serial numbers - LZ42 662245, LZ50 329165, LZ58 808333, LZ68 674151, LZ73 537302, LZ77 928846 and LZ83 445751. All in various presentable higher grades in average GVF to EF