I successfully installed this on my phone about 20 minutes ago and made a payment, all confirmed.
Then I thought "Oh I'll just log on again and check back at payments in to my account, I forgot to do that".
So I entered the 3 requested digits of my "passcode" and got "something's not right, try again". Tried again, same message. Tried again, now going to be locked out.
FUCKS SAKE! I just created that passcode 20 minutes ago. I have NOT forgotten it. Fuckingfuckingfuck NatWest up the jacksy.