Finally received the letter, it states:
CASHBACK PLUS
Dear Mr and Mrs
I am very happy to confirm you existing mortgage is entitled to our Cashback Plus which will be paid within 45 days of the 5th anniversary of your initial mortgage drawdown subject to:
> Mortgage remaining open as at that date
> House being your occupied as your private dwelling as at that date
Please see full terms and conditions on your original mortgage Letter of Offer
Yours sincerely,
Bank of Ireland