This recent paper shows the increasing trend in hypothyroidism and treatment in the UK:
Thyroid
.
DOI: 10.1089/thy.2018.0251
1
Thyroid
Trends, Determinants and Associations of Treated Hypothyroidism in the United Kingdom, 2005 – 2014 (DOI: 10.1089/thy.2018.0251)
Salman Razvi, Tim I M Korevaar, Peter Taylor
If the paper is not accessible to TUK through this, I have a copy I can send to Louise Roberts for access in full.