Michael McGrath (Cork South Central, Fianna Fail) | Oireachtas source

I just want to ask a technical question. If someone is on a variable mortgage and when they got the mortgage they were in a certain LTV bracket of maybe over 80% but some years later the property value has increased, they have more equity in the property and they fall into a lower LTV band, which would attract a lower interest rate, can they revise what band they are in or are they fixed in the band at which they entered when the mortgage was drawn down?