None of this is any surprise to me, I've lived it.
I had £1.77 to last me 9 weeks - over the Christmas period, so that made it even more fun with a small child who was sooo excited because he'd tried so hard to be such a good boy so Santa would come (had to go into school as weeks of Christmas themed activities had wound him into a frenzy and I knew we weren't the only family in that situation).
I came home to find British Gas had broken into my house and installed prepay meters, as I couldn't pay the bill with £1.77. No letter received warning of this, despite their claim to have sent them. Couldn't prepay for any gas or electric either, during the coldest months of the year. BG did then give me an 'emergency once in 12m only' credit meant to last the estimated 6 weeks until I got my UC. Ran out after 4.5 weeks of only heating the house for 30 mins a day, as it was -10C!
The food bank were lovely, but each time I left with a couple of bags of tinned spaghetti hoops and cheap bread that lasted about 3 days max. You can only go to one 3 times in 6 months. So 9 days of food to last 9 weeks! And not a single fresh fruit or vegetable, as they can't store them.
I fed my kids and basically ate very little apart from porridge for 9 weeks. I lost 1.5 stone and I am thin to begin with. Developed anaemia, and Vit D deficiencies. And when I did get paid, I owed so much for bills that went unpaid while I waited that it took many months before I was anywhere close to managing to feed, clothe and keep us all warm again.
But it's supposed to be like this, it's specifically designed to be, to put people off claiming at all if they may find work quickly. It 'encourages people to work', see! 
I remember being threatened with a sanction as I couldn't attend a JC interview at 3.10pm (had to collect child from school). I just laughed and asked what on earth she thought she was going to deprive me of as I was getting fuck all anyway!
If I'd had an abusive ex hanging around wanting to get back together, I would absolutely have gone back to them, for the sake of my hungry kids who literally sat in the dark shivering! I'd have put up with anything so they didn't have to go through that.