"" If you’re on maternity leave with his child then surely you AND he have £5500 on a CC not just YOU.""
While finances should be shared, you don't have to take on debt that occurred before the relationship.
"" If you can't afford it don't buy it.""
Living without a fridge freezer or washing machine would have cost me more than the small amount of Interest that I paid.
I now have around £900 worth of debt, which I can manage, to pay off, as I'm already on the lowest income that I can be (disability benefits), so I'm not going to have a 'shit-hit-the-fan' moment and not be able to cope.
I consider it controlled nesesary debt. If you have disposable income, family/friends who can help out, then good for you. I don't.
I'd also take Martin Lewis's advice about using my credit card (Halifax), when going abroad.