I was aware that the login change was going to happen but because I didn't know exactly how it was going to happen I chose to use my personal username and login details as the default rather than the business one. It all worked well for me and I can access personal as well as business.

Now I wonder which login details I will have to use when I submit my e@syfile 501? I would assume that it would now be the personal default ... but assumptions can be very wrong!