My favorite was Abena Abri-form Level 4, which is made in Denmark. Now I've tried Betterdry, which is made in Germany. Both are very good. My opinion of the Betterdry, both Days (M7) and the overnight (M10), is they're very impressive.
The plastic backsheet on the Betterdry is sort of stretchy, but no matter how snugly I've taped them on, I've never had a tape failure or a plastic tear. They've also never leaked in the 3 months I've been wearing them, day and night.
For what they are, I don't think either is really that pricey. I'm sure since both are European, they would be available in the UK.
Here in the US, the regular (M10) Betterdry is about $1.63/diaper. Not sure how that converts to your money though.