DTA = Double Tax Treaties, quick search on Google pulled up the this HM Revenue & Customs: Double Taxation Agreements, Tax Information Exchange Agreements and Social Security Treaties that describe it very well.
TIEA's = Tax Information Exchange Agreements, some "evil invention"😛 from the OECD, you can find more information here, HM Revenue & Customs: Double Taxation Agreements, Tax Information Exchange Agreements and Social Security Treaties
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Disclaimer: Nothing I say should be taken as tax, legal or financial advice. Anything I say is for general informational purposes only. Always seek independent professional advice.