please empty your brain below

The list of districts you haven't been to is impressively short ... but I suspect very difficult and extremely expensive to achieve completeness.
Postcode areas.
Today’s post is about postcode areas.
From almost all of your un-visited list it looks like "the grand tour of Scotland" would be appropriate
I’d understood IG was Ilford & Gants Hill
I remember having to learn every one of these in order to become a Postman Higher Grade.
It took me until I got to the "Postcode areas with the highest population" list to realise that Northern Ireland's BT was for Belfast. Prior to that, I was reading this thinking to myself, "Why is Northern Ireland BT?"
There may be a few other postcode districts with high numbers, which are generally non-geographic ones, e.g. E98
The ‘99’ postcode district is more widespread than just Bradford. It’s a non-geographic code used for businesses that receive lots of mail so have a dedicated postcode. Eg SS99 1AA is HMRC. I think most postcode districts have a 99 variant.

Speaking of 1AA, the postcode of the mail Royal Mail delivery sorting office for an area is usually XX1 1AA. This is useful should you want to enter a junk address on a form which requires a valid postcode.
It's Sutton and Merton, having lived in both.
Looking at that Wiki map, as many postcode districts are quite large, I can tick off a lot more than I had thought I could. A task for a rainy day!
First Direct bank has its HQ in Leeds and uses LS98 1FD as its post code. I presume LS98 is a non-geographic postcode area although it is in Leeds. The 1FD bit is obvious.
Having worked in a national customer contact centre whoever thought up CB and CV needs shooting
Looks like I've been all to the mainland postcode areas; just KW and ZE needed to complete the set.
Some of the British Overseas Territories have a UK postcode. The island of St Helena is STHL 1ZZ, supposedly introduced so that mail for the island didn’t end up at St Helens in Lancashire.
I seem to remember that the National Giro headquarters in Bootle had a special postcode GIR 0AA
Trip to Dumfries calling?
As someone whose family comes from St Helena and lived there for 6months a while back, I can confirm AI Holmes comment. You should also write South Atlantic Ocean, after the postcode, to prevent post sometimes ending up in parts of the USA or Australia. And even with all that, post can still sometimes end up thousands of miles from where it should, and in days before the airport, could arrive many months late. Now more likely to just be a few weeks late!
Outdone, no doubt, by the areas covering the Scottish archipelagos, PO area is unusual in covering nine different pieces of land. Portsea Island is covered by PO1-PO5 and Hayling Island by PO11. The Isle of Wight is covered by PO30-PO41. Whale Island and the four Solent forts are each attached to a different postcode district (PO2, PO4, PO5, PO33 & PO34 respectively). The remaining districts are on mainland Britain.
Retired postie here.
I believe that the IG postcode is Ilford and Goodmayes, to the best of my memory.
Why 'technically'?
I think the number of postcode areas you HAVEN'T visited could be switched with the number of postcode areas I HAVE visited!
You prompted me to look at the map. Interestingly a significant part of the Scottish mainland is within Kirkwall. Does this mean their mail is delivered via the Orkneys?
CH (Chester) also covers parts of Wales.

dg writes: added, thanks.
I note that my local areas SO and SP are adjacent alphabetically (in the list of postcodes) as well as being adjacent geographically.

I wonder how many examples there are of pairs (or strings) of adjacent postcodes.
Your list of unvisited postcode areas does not include G but does include all four areas enclosing it...

dg writes: incorrect

...so I'm guessing just passing through doesn't count (and you can't have flown to Glasgow because the airport has a PA postcode

I'm surprised that my list is shorter, being only SR (although I have driven down the A19 a few times), HS and ZE
Pete M - Several pairs:
BB/BD
CM/CO
DH/DL
E/EC
SO/SP (SN also adjoins SP but not SO)
WS/WV

And one triple: TW/UB/W
Does IV include oil rigs, or are they outside the system.
You should go to DG, DG. It's quiet, lovely scenery and lots of places to visit.
Should "Postcode areas with only single-digit districts" include LU? Or perhaps I have misunderstood.
Postcode areas containing letters not found in any other postcode area:
TQ ZE (JE)

Postcode areas with only one neighbour (bordering by land):
FY KW TR
The 2004 Post Office address manual gives the meaning of IG as 'Ilford Grounds' whatever that means. I suspect what we have here is similar to London Bus class letters where different people came up with codes which meant something to them at the time but most users do not care and just get on with the job.
Ken - Do you actually know that SM is so named for Sutton and Merton, or are you just assuming because you know it covers both, and you've lived in both?

SM covers Merton as well as Sutton and Morden.
The City of Sunderland uses three different postcodes SR, NE, and DH.

I don't know if any other city other than London has different postcodes in its boundaries
Western Central London or West Central London? One of each appears in adjacent paragraphs.
Roger, technically speaking both monikers are very misleading (certainly not 'Central London'). If you look at the WC boundaries, its western areas cover the far east of Westminster (Leicester Sq, Covent Garden) and southern part of Camden (Holborn, Seven Dials/Shaftesbury, British Museum, UCL...) - both are in the vicinity of the county border with the City of London. EC is obviously pretty much entirely City.

Thus it excludes a VERY large part of what we call 'Central London'. Places like Soho and Oxford St all belong to W1, and you have e.g. Buckingham Palace, Belgravia in SW1, Marylebone in NW1...
In a manner of speaking the WC area could be described as "Eastern West End" but before getting tied in knots over geography I should remember that the extent of many of these areas are dictated by the location of major sorting offices.










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