Anyone over 21 who is a British, Irish or Commonwealth citizen can stand except peers, bishops, undischarged bankrupts, prisoners and certain officeholders including judges, services personnel, police officers and other civil servants (persons holding offices of profit under the Crown). (politics.co.uk)
Members of congress, and persons holding any office of profit or trust under any foreign power, other state of the union, or under the United States. (ballotpedia.org)
Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress: but no Senator or Representative, or Person holding an Office of Trust or Profit under the United States, shall be appointed an Elector. (politics.stackexchange.com)