We have a property we love (over £1m). There isn't much competition, but there is another interested buyer and if we took our sweet time over it, there is a possibility (however remote) that they would offer an amount such that it becomes out of our budget.
AIBU to offer more than I think it's worth on the basis it is a forever home, so even if it might be priced more per square meter it doesn't matter at the end of the day because I will live in it and raise my family there and so who cares if others buy properties down the road for more of a bargain?