Even if the figures were to be published, what would they reflect - stated rate multiplied by 25 or 30 year mortgage term, assuming no extra repayments, no withdrawals, no refinancings, no change in the fixed vs variable mix, no further change in rates (up, down or sideways), no sale of the property (ie: you stay put), etc?
In other words, essentially meaningless information which would carry limited or no effective weight (except perhaps when someone tries to come along and then argue that, they published the repayments and said that rates would not change, but they have changed, and now I want to sue them).