???
Possibly to do with conflict of interests? As in accounting firms doing audits for companies, but also doing tax work, legal work, management advice, bank presentations, etc. If you're doing all that, you're going to be on good terms with the client and maybe more involved than you should be, and that might make it harder to maintain objectivity in the audit.
Websites - dunno really. Try icai.ie for starters, I suppose.
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