Hi Sharon2021,
As it is an unsecured loan you just have to be up to date on the loan for at least 2 years(I.e. arrears cleared in full) and Finance Ireland will assess your case.
I'd have to double check but I'm pretty sure if you satisfy the above condition you'll qualify for the Progress product which is the cheaper of the two mortgage products Finance Ireland offer.
Furthermore, as a public servant, there is a good chance that the bank will work off a salary level that is 2 points up on the scale from you are now and allow 50% of last years overtime to be assessed.
I hope this helps.
Best of luck!
Justin
justin.griffith@mortgagebrokers.ie