Possible face values:
Local Letter up to 100 g (initial value: 47 p)
UK Letter up to 100 g (initial value: 57 p)
Europe up to 20 g (initial value: 64 p)
Local Large up to 100 g (initial value: 73 p)
Intl Letter up to 20 g (initial value: 85 p)
UK Large up to 100 g (initial value: 95 p)
Possible face values:
Local Letter up to 100 g (initial value: 49 p)
UK Letter up to 100 g (initial value: 63 p)
Europe up to 100 g (initial value: 73 p)
Local Large up to 100 g (initial value: 79 p)
Rest of World up to 100 g (initial value: 90 p)
UK Large up to 100 g (initial value: 1.07 £)
