Saxenda and Ozempic are different drugs that work the same way. Ozempic and Wegovy are exactly the same drugs but Wegovy is a higher dose.
The evidence appears to suggest Ozempic is more effective than Wegovy (and some posters on this thread who have tried both seem to agree) and Wegovy is the most effective of all - understandably as it is the highest doses of the lot.
However some people don't respond at all, if you don't put in the work yourself you get nowhere as none of them are magic bullets. I definitely have seen people on them for diabetes who aren't losing weight, they aren't even getting side effects - I don't know how as I'm chugging Gaviscon if I eat over 400 calories or even look at a chocolate bar.
Online, if you are paying hard cash and have the right BMI, of course you will qualify. It's a business. No idea what the NHS is doing.