The ACCA (www.accaglobal.com) does make it compulsory for its practising members to use engagement letters. Para 3.18 of its rule book states:-
"Members must record in writing and send to their client a letter of engagement which sets out the terms under which they are agreeing to be engaged by their client before any work is undertaken or, if this is not possible, as soon as practicable after the engagement commences."
"The letter of engagement should set out in detail the actual services to be performed...."
ICAEW doesn't specifically require a letter of engagement but does say that a written record of the agreed scope of services is required.
"Members must record in writing and send to their client a letter of engagement which sets out the terms under which they are agreeing to be engaged by their client before any work is undertaken or, if this is not possible, as soon as practicable after the engagement commences."
"The letter of engagement should set out in detail the actual services to be performed...."
ICAEW doesn't specifically require a letter of engagement but does say that a written record of the agreed scope of services is required.

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