Details of the MP expense claim system budgets can be found on the website of the Independent Parliamentary Standard Authority.
Office, Staffing and Accomodation expenses are subject to a budget cap, only travel and subsistence claims are unlimited.
On Underground train from Westminster to London City Airport on way home. At Southwark train was stopped and announcement made advising passengers to use alternative means of transport if possible. If I missed the plane I would have to incur an overnight Taxi 17 May 2012 Non-London MP-to/from London From: Southark To: London City Airport