Offer your thoughts or opinion on the input financial query or topic using your financial background.

Is it preferable to move emergency savings/retirement into offset mortgage?
Assuming no constraints on how much you can move (or how frequently) into and out of your offset mortgage account, the question becomes one of what rate of return you expect from your long-term savings/emergency cash fund. The rate you are getting from the offset mortgage account is known; since it reduces the principal amount owing and thus reduces interest charges, the return is the mortgage rate (though I would not be surprised if the offset mortgage account contract has bells and whistles reducing the effective rate, saying something like 3 pounds reduction of principal for every 5 pounds you put in). So, as a movie character once said, "Do you feel lucky today?"  If so, move money from your offset mortgage account to savings, and earn more.  If not, move money in the opposite direction. A "guaranteed" 2% return on the offset mortgage account might be better than taking a risk on the vagaries of the stock market, and even the possibility of loss in your long term savings account.