Thanks to everyone for all your input and points to consider. It has been really helpful.
Just to update on our situation... after telling BOI that we would be proceeding with KBC and organising valuation etc with KBC, BOI came back to us at the 11th hour with an offer of 4% variable plus the 2% cashback. They have stated that should their variable rate drop, our rate will drop in line with this. I've asked for written confirmation of this and we've decided to go with their offer. Even being tied in for 5 years, the difference between what they've offered vs what KBC are offering is very little in terms of rate and a lot in terms of cashback. I went back to KBC to see if they could improve their offer but all they could say was their variable rate "might" be dropping in july, they couldn't say yet by how much.
We're delighted with the reduction in rate and I'll be keeping a close eye on things over the next 5 years.
Thanks again to you all - this really is a brilliant site.
Thanks for the update.
All in all that looks like a pretty good deal but I think you should look for confirmation from BOI that your loan agreement will specifically provide that you will be charged a discount of at least 0.5% on BOI's SVR throughout the life of the loan (or at a minimum for the five year tie-in period) and this % discount cannot be varied to your disadvantage during that period.
Banks (and BOI has particular form in the UK in this regard) will exercise whatever contractual flexibility they have to adjust interest rate margins where they judge this to be in their commercial interest.
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