Wild Billy wrote:

Do many people in the UK show signs of "Mad Cow Disease"?

No, and they never did, although it was a tragedy for those families who
lost loved ones.

It was just one of those hyped-up extraordinarily rare diseases which
"professors" who should know better (but obviously didn't) pontificated
about in a purely self-publicising manner. The main pathogenic effect of
MCD was to sell newspapers.

--
Jeff