My wife earns £30k pa, so on the cusp of the skilled/unskilled pay threshold. Phd & masters degree in genetics and 20 years practical experience in that field. She's explained to me umpteen times what she does, and I still don't understand. So, in my view, she is highly skilled in her field. But the job opportunities in this industry (research) are not generally well paid/rewarded in this country.