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.
Cheshunt to Westminster (National rail and Underground). Oyster card payment for constituency staff member to travel from home to Westminster and back for training day in Parliament. London-constituency MP & Staff
TfL and Rail travel to and from London for constituency based staff doing training Travel costs - staff Staff Home Office to London From: Enfield Lock To: Westminster
Westminster based staff member covering in constituency office Working in constituency Staff Home Office to Const From: Parsons Green To: Turkey Street
Staff based in Westminster - travel to constituency to provide cover for annual leave Staff travel to constituency Staff Home Office to Const From: Stockwell To: Turkey Street