I disagree, my broker ran through the figures upto 12%.
It's part of being a responsible lender and not setting people up to fail.
We've taken an initial 5year fixed and then another 5year fixed at the end of that, were coming to the end of that second fix period and we'll need a 2-3 year to get us paid off.
How people laughed when we said we'd fixed at 2.04% when 1.3% rates were on the table.
We worked out what it would cost us at 8% and have paid that amount as an overpayment amount since day 1.
Have a look at money supermarkets over payment calculator. Over payments have bought our minimum payment down to £190
The rates for the last ten years have been incredibly low and a return to higher standard rates was inevitable. It's a couple of years late as the BOE have been slow to act.
Everyone should have been overpaying while rates have been so low, it would give a double whammy now rates are rising.
Failure in the OPs case to realise the rates would rise and failure to point it out and check affordability by the broker or lender has lead to this situation.
Had the lender pointed out the cost of the mortgage at 6,8,10% then the op may not have taken the mortgage, had they explored the affordability and found the OP would be in difficulties they may have declined to offer the mortgage.
This is the thin end of the wedge if the OP has other borrowing, Don't forget the rate rises will affect other credit such as loans, credit card rates, store cards and accounts like next accounts, insurance (where paid monthly) car finance including the god awful PCPs and even potentially things like Mobile phones.
Things like phone contracts, Internet and telecoms, even rail fares are subject to rpi rate increase so we will rise more than normal.
The OP needs to think carefully at this point and consider options should the mortgage rises be untenable.
Talk to the lender and their "difficulties paying dept", they're always much happier to help before arrears occur.