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OK Ta. I assumed I'd be able to "white list" the domain somewhere along the lines.
It looks like you're already having policy (what the DMARC record says to do) over-ridden by your ISP as they should (if it's a double failure) be deleting the email rather than putting it in the spam folder.
It might (outside chance) be being spam-foldered due to failing SPF, but not being deleted because it passes DKIM, but the sending IP reputation should be good enough to make that a non-issue.
Look in the header and see what it's passing and what it's failing and report back.
@Dammit
OK Ta. I assumed I'd be able to "white list" the domain somewhere along the lines.