Abbreviation for Advanced Diploma in Accounting and Business

I’ve just been awarded the Advanced Diploma in Accounting and Business by the ACCA. My question is, what are the correct post-nominal letters to use? I know that I could use AdvDip, but that doesn’t quite say much in terms of what the Diploma was for, or from whom.

Examples are:

– AdvDip Acc. Bus.
– AdvDip AccBus
– AdvDip Acc. & Bus.
– AdvDip Acc. Bus. (ACCA)
– AdvDip AccBus. (ACCA)
– AdvDip Acc. & Bus. (ACCA)

Etc.

Also, would the inclusion of the letters ACCA in brackets still be disallowed? In other post-nominals, it is common to include the name of the awarding institution or university in italics. But given that ACCA affiliates use the actual letters, how would an ACCA Diploma holder indicate that in their post-nominal?