I’m on Smarty, sim only, powered by Three, currently paying £8 a month for 50GB (it’s a 16GB deal with a free hike to 50GB for 12 mths, 7 mths remain) free EU roaming up to 12GB fair use. Monthly contract, no annual price rises and no credit check.
Been great, was with Three for yonks, mostly because of the worldwide roaming, but the annual hikes made it increasingly expensive. Smarty has been £8 for me for nearly 2 years & has been faultless.
In life, it's not who you know that's important, it's how your wife found out.