Under the current rules, British MPs can claim an Additional Costs Allowance of up to £24,000 a year.
(It goes to MPs from outside inner London to cover the cost of staying away from their main home when carrying out parliamentary duties. It's crazy, many people earn a lot less than this and work thousands of miles away from home.)
!Note - They've offered to give up this allowance, in exchange for a £40,000 pay rise! These guys are so out of touch!