Let me take the subjectivity out of it then, as that's a fair point.Salary is subjective. What you consider a “good” salary might be totally polar to what others consider based on experience, industry etc. Against the average - yes (maybe), you could say it is good. However, this is a really bad example but go ask a CIO of a fortune 100 company if "100K" is a good salary.
On average, £100k per year is a very high salary as it is earned by less than 4% of the working UK population.