Unfortunately, since the 2008 crash, the world has gone mad.
We used to have such things as non status mortgages. If you were borrowing just a small amount and had an LTV ratio of under 60%, they didn't care less about your earnings. There is no risk to the bank. If you don't pay, the house is sold, and the bank get their x% of the proceeds back, the amount they are owed.
Today, there is still no risk to the bank. If your borrowing £25K on a £250K house, where's the risk?. The bank are going to get their money back whatever happens.
But crackpot FCA "sledgehammer to crack a nut" rules means banks are not allowed to loan money to people who may not be able to pay it back. If you are unemployed, the bank can't lend you £10K to buy a £1m house, even if you are using £990K of your own money to fund the rest.
Because to much emphasis has been put on consumer rights, if they lend you £10K to buy a £1m house, and you can't afford the repay it, you can complain that you were given a loan you couldn't afford to repay by the unscrupulous bank, and not only will you not have to repay the £10K, you'll probably get awarded £20K for the stress they caused you.
As I said, the world has gone mad.
It's not the risk of losing the money the bank are scared of, it's the risk of you suing them for giving you the loan in the first place.