Unfortunately it is as common as anything else these days.
I had to apply for a DRO last year for about £24000 worth of debt. It has since been raised to £30000 (limit) as that many people were applying for them and being slightly over. Long story short with me I had took out a loan while in a well paid job (taking home £4000-£5000 a month) me and my partner had our first kid on the way, loan went towards home improvements, a family car etc.
Our kid was born 6 weeks early and as a result was in intensive care for just over 5 weeks, unfortunately my manager at the time wanted me back into work after 3 days, even though our kid was 30 miles away in another hospital. So I lost my job and then it was harder to find a similar paying job whilst having a baby at home etc.
I remember the Citizens Advice worker who went through my DRO, he said they were getting at least 40+ applications a week just in that office, when they sometimes only got about 4 a month. Covid with the loss of jobs etc hit a lot of people hard who had manageable debt before hand, or become in debt because of it.
As people have said, read through MSE forums etc and a few others, people are now routinely in debt of £50k plus, or more. One of my old work colleagues had to take out an IVA, one of my old project managers who was on £90k a year has had to file for bankrupcty recently.
We have this discussion a lot at work, but I think with recent cost rises,and no doubt again next year with shopping/rent/gas/electric/fuel etc, the average family who earn about 30-45K will start to struggle imo. Families below that will start to get to the breadline at current rates.