Fair enough. If you’re in IUP then why not upgrade.
I’ve not paid much attention to the IUP, are the monthly prices the same for the 7+ and 8+? Do you have to pay the £69 initial payment again?
The 7 Plus 256 was £49 down-payment and 20 payments of £49.45. I don't know what the down-payment for the 8 Plus would be, but the monthly payments for the 8 Plus 256 are £51.45. This also includes AC+