(1) For the purposes of this Part -
(a) an "appropriate officer" is an officer who has received appropriate training and who has been authorised in writing by a law enforcement authority or the Gambling Commission to make requests under this Part;
(b) a "senior officer" is an officer who has received appropriate training, who has sufficient knowledge of money laundering and terrorist financing, and who has been authorised in writing by a law enforcement authority or the Gambling Commission to authorise or refuse the making of requests under this Part;
(c) "credit union" means - (i) in England, Wales and Scotland, a society which is registered as a credit union under the Co-operative and Community Benefit Societies Act 2014 [2014 c. 14.]; (ii) in Northern Ireland, a society which - (aa) is registered as a credit union under the Credit Unions (Northern Ireland) Order 1985 [1985 No. 1205 (N.I. 12).] and is an authorised person; or (ab) is registered under the Co-operative