The chairs of (the majority of) select committees have been elected by the house as a whole since June 2010: before that members were appointed by their parties and chairs voted on solely by those members.
（大多数）专责委员会的主席自2010年6月以来是由全院选举产生的：在此之前，委员会的委员由政党任命，主席仅由这些委员投票选举产生。