This type of I.D. Badge wallet was used by Commissioned Officers of HM Customs & Excise up to the time of the merger with HM Inland Revenue, when a new department called HM Revenue & Customs was formed.
A similar wallet was issued to the National Investigation Service with the words HM Customs & Excise National Investigation Service below the Portcullis.
This above ID Badge wallet was available to Officers of HM Revenue & Customs with a separate pouch for the inclusion of an identity card containing a photograph of the Officer +signature.
I believe this ID Badge wallet was issued to members of the Royal Ulster Constabulary, but nothing else is known.