The following postcodes are not considered part of UK mainland:

AB31

AB33-38

AB41-45

AB51-56

BT

EX39

FK17-21

GY

HS

IM

JE

IV

KA27

KA28

KW

PA20-49

PA60-78

PH17-26

PH30-44

PH49-50

TR21-25

ZE