Spoiler alert: the answer is “significantly”.
Unless you’ve been living in a cave on Mars for the last week-and-a-bit, you can’t have failed to hear about the ongoing chaos at TSB as they attempted to migrate customer records from their old Lloyds TSB system to their new one.
If you’re not a TSB customer or an IT contractor, you may well have only given the story a fleeting glance. If so, you can bring yourself up to speed with the BBC’s timeline of events. Otherwise, all you really need to know is that all did not go as planned. There have been numerous problems including customers not having access to their accounts online, over the phone or in-branch, payments in and out of accounts not going through, and people being able to access accounts that were not their own.