It was, I believe, one Lord Lovat in 1747. It should be noted that beheading with the axe on the block at Tower Hill was the penalty only for High Treason; and then only as a privilege restricted to noble people ~~ others had to undergo the unspeakable 'hanged, drawn & quartered' {only look it up if you have a strong stomach!}. When Sir Thomas More fell out of favour with Henry VIII and was convicted of High Treason, it was only a special concession on the part of the King himself which allowed him to escape this penalty & be beheaded as if he were a nobleman, which he was not.

~M~