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HMRC internal manual

Inheritance Tax Manual

HM Revenue & Customs
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Communications: British Document Exchange: what is British Document Exchange?

British Document Exchange (otherwise called ‘Britdoc’ or ‘DX’) is an alternative to the Royal Mail for sending business letters to agents. It is a licensed private postal system whose membership includes many solicitors and accountants and some Government departments.

The service

  • offers a considerable saving over normal postal costs, and
  • undertakes to deliver all DX correspondence by the following day

All members of Britdoc are required to display their

  • DX number, and
  • exchange location

on their headed notepaper

A number of solicitors and accountants display document exchange addresses on their letterheads for exchanges other than DX. These include

  • CDE (City Document Exchange)
  • LDE (London Document Exchange)
  • MDX (Midland Document Exchange)
  • NDX (Northern Document Exchange)

DX will deliver to these exchanges.