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.
Travel between Constituency and Westminster (£18.50 ticket + 'excess' ticket of £11.40 purchased on train to make up fare) Travel 4 Const Home to Westminster From: Warwick To: London