In May 2009 the Parliamentary ombudsman instructed Keen to repay £4,583 for sending unsolicited letters to her constituents. Keen invited them to coffee mornings using prepaid envelopes and on House of Commons headed stationery, a breach of Parliamentary rules as they are only permitted to be used for replies. Keen said the correspondence was sent by "a new member of staff ... on House of Commons instead of constituency stationery. When it was brought to my attention I immediately refunded the cost."