acknowledgement letter
111(in CASS 7) a client bank account acknowledgement letter ( a letter in the form of the template in CASS 7 Annex 2 R), a client transaction account acknowledgement letter (s a letter in the form of the template in CASS 7 Annex 3 R) or an authorised central counterparty acknowledgment letter (a letter in the form of the template in CASS 7 Annex 4 R).