Adults aged between 40 and 74 in England invited for this health check. Local Authorities in charge of it seems it's a public health programme aimed at preventing and identifying individuals at high risk of developing or having heart disease, stroke, kidney disease, type 2 diabetes and certain types of dementia. Chronic kidney disease has similar symptoms to thyroid as does diabetes.
Exclusions are if you have been diagnosed with:-
Coronary heart disease
Chronic kidney disease
Transient Ischaemic attack
Peripheral Arterial Disease
Are on statins
It states if you are concerned about your health, don't wait until your NHS Health Check to do something about it go to GP and ask for your health Check. Some local chemists are offering this service.
Hope it's of use.