I have my mortgage with Nationwide. I took it out in 2000 and have ported it to two other properties since then. Over the years I have taken further borrowing a few times, taking advantage of the increase in my property's value in order to finance other purchases like a car etc..
These days, still with Nationwide, I have 4 separate mortgage accounts -- the original one, plus the others for further borrowing. Every few years I ask if they can be consolidated into one in order to simplify the payments, but they tell me that's illegal in the UK unless I pay them all off and change provider.
The reason it's awkward is mainly having to do with multiple payments. For example I recently asked them to change the account that the payments were taken from, but they only changed one of the payments, so the remaining ones were from the old account.
Can anyone explain if this is truly the case, and if so why? Wouldn't it be simpler for the mortgage provider as well as me if it was one account?