Something to watch out for is when your mortgage payment changes -
I've got two trackers with BM and its seems that if your payment date is between 1st - 8th of the month then your payment won't change for an extra month. BM say this is because they have to give 30 days notice of a DD change once the rate change takes effect, ie 1st November (-0.5%) and 1st December (-1.5%)
I'm still waiting for written confirmation of this but having spoken to 2 people at BM it appears that if your payment falls between 1st and 7th of the month like one of mine does then your payments won't go down in respect of the first 0.5% drop until 7th January 2009. This is even though the payment on 7th December relates to interest at the lower rate for November 2008.
It doesn't seem to make much sense to me but assuming that most people probably pay their mortgages during the first week of a month to coincide with payday its probably a nice way for BM to get some extra cashflow to invest for 30 days. If I'm still on trackers when the rates go back up I will definately be ensuring that BM follow the same practice.
To get around this call it might be worth asking BM to change your payment date to something like 10th of the month and do it quick so that you can get the effect of the 1.5% change during Jan 2009. However if you have already changed your payment date in the last 12 months you can't do it until the 12 months is up!
PS - According to my broker BM don't have a collar so at least the rates will continue to follow the base rate to whatever the base rate does.
PPS - What happens if your tracker rate should effectively goes below zero?