I'm currently with Giffgaff which i'm happy with but this company prices are even better
https://www.whitemobile.com/white-mobile-rates/
https://www.whitemobile.com/white-mobile-rates/
I wouldn't say they are at all. I'm on giffgaff, and for £15 I get 500 mins, unlimited texts and unlimited data,
On white mobile I'd get 500 minutes, but only 500 texts and, crucially, only 500mb of data. It's a pretty crap offering to be fair