Was your mortgage a tracker day one or did you switch from an ordinary variable to a tracker, then to a fixed?
I don't think that will always be relevant.
Another poster advised that Ulster Bank's loan offer at that time provided as follows:
AT THE END OF THE FIXED PERIOD: Ulster Bank Ireland Limited may offer to continue the advance for such a period and at such a fixed rate as it may decide. It may also offer alternative available products. If such offer is made and you elect to accept then you must do so in writing, your acceptance to be signed by all parties to the mortgage and to be received by Ulster Bank Ireland Limited. If of no such offer is made or if an offer is made and no acceptance received as prescribed above, then, from the day following the expiry of any option selected above, the Ulster Bank Home Loan Rate shall apply in accordance with General condition 2 of the
Offer of Advance originally accepted by you being the Bank's General Conditions Relating to Advances by Ulster Bank Ireland Limited House Mortgages Section, which varies the Interest Rate, and the said General Conditions relating to the Advances shall be construed accordingly.
In other words, Ulster Bank's offer provided that at the end of the fixed term a borrower would default to whatever rate was provided for in their original loan offer, regardless of whether they subsequently switched to another rate. So if a loan started off life as a tracker, a borrower would default back to a tracker at the end of the fixed term.
However, that does not appear to have been the standard approach adopted by all lenders at that time. KBC's loan offers appear to have provided that borrowers would default to KBC's SVR at the end of the fixed term whereas PTSB's loan offers seem to have invariably provided that borrowers would default to a tracker rate (although the margin was not always specified).
I would be very interested to know what BOI's loan offer specified would happen at the end of the fixed period.