text: Some geographic postcode sectors or districts are set aside solely for non-geographic postcodes (e.g. BS98, BT58, EC50, IM99, JE4, M60, N1P, NE99, SA99, SW9 and WV98).  Though there are no binding rules, the first two numbers in the range 91 to 95 are often allocated to businesses and in the range 96 to 99 to Government departments.  However, there are many exceptions to this (e.g. American Express has the postcode area BN88; in Glasgow G58 is allocated to National Savings, as part of a mnemonic postcode G58 1SB, though it is located in G43 postcode district; and in Glasgow G70 is allocated to HMRC which is located in G67).
  The letters HQ for the last two letters may also mean it is most likely a non-graphical postcode or that Royal Mail holds the mail where a redirection, bulk mail delivery or open and scan to email service is available.
  Girobank's headquarters in Bootle used the non-geographic postcode GIR 0AA. There is also a special postcode for letters to Santa/Father Christmas, XM4 5HQ.
  Many non-geographic postcodes do not appear on Royal Mail's own online postcode finder tool or their Click and Drop online postage printing tool, which can add to confusion when responding to organisations that use such addresses. Likewise, delivery services or couriers other than Royal Mail may not be able to deliver to such non-physical addresses.  The UK government provides alternative geographic addresses to BX addresses for couriers.