I'm assuming that, in each case, the property in question was your PPR and not an investment. FTB rates of TRS apply for the first 7 years. If you switch mortgages or PPRs then, as far as I know (having been corrected here on AAM a while back), you still qualify for the FTB rate for what remains of your 7 year period. I presume that you get the Budget 2007 new rates for the remainder of your FTB 7 year period.