From 1 January 2019 if you apply for a credit card, the credit card provider must check that you can afford to pay off the whole credit limit in three years.
Credit card limit increases
Also, credit card providers cannot contact you in any way to offer to increase your credit limit. (Like they can’t ring you, send you stuff in the mail or email you to ask if you want to put your limit up.)
Even if you said before that you want to get offers about credit limit increases, they’re STILL not allowed to contact you anymore. This is for both new and existing credit cards.
For credit cards provided from 1 January 2019, credit cards providers must let you reduce your credit limit or cancel your credit card online.