1. You got them from 1 source so it's not wholly representative.
2. Quality of service doesn't just depend on speed. There are other factors that come into play such as customer service. For example, I can get a reply from Game2XS to a query in less than 10 minutes usually, and I'm not even one of their customers. I'd call that quality service.
3. Fr4g only has the lowest pings out of the providers tested, not out of the whole UK because there were many that you missed out.
I'm not taking sides or anything - I'm just pointing out the factors that you've overlooked.