Yep ta, I've read a little about these kind of things. Don't think it's really my cup of tea but I will read some more into it before I re-mortgage.
I have also been doing exactly the same for years. However the fact remains that the money in your current account being maintained at a "spendable level" is earning very little interest.
Check out the
Halifax current account
This means you can continue to put your savings into a high interest account (where it earns good interest no matter how much is in there) and the spending money in your current account also earns good interest.
I spend too much time thinking about these kind of things.....