UK postcode, the outward code then the inward code, the space between them optional. A UK postcode is far narrower than a continental one, often a handful of addresses, so it identifies much more than five digits elsewhere.
Label: UK_POSTCODE
\b[A-Z]{1,2}\d[A-Z\d]?\s?\d[A-Z]{2}\bDeliver to SW1A 1AA please. → SW1A 1AAOffice at EC1A1BB in the City. → EC1A1BBABC1 1AASW1A 1ATags: uk, location, contact