> Well actually XY2 19AB is invalid. Postcodes only have one digit in
> the second half, so it's always possible to insert the space correctly
> as the fourth character from the right.

Sure, we know that, but if the geocoder is presented with a string
that is not a valid postcode format, results could be unpredictable.
Should we expect it search for XY2 or XY21 ?  If it is looking for a
non-existent XY21, should it consider XY20 a closer match than XY2 ?
Should it treat it as a postcode at all, and instead find a building
address, 19A or even 219A ?    Its just a variant of GIGO.

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