46 London used expenses loophole , which is not against parliamentary rules . Allowed to claim £20,600 a year in MPs rent and £150 a night for hotels . Mortgage claim ban forced them to let out second homes , London said .
46 MPs used expenses loophole , which is not against parliamentary rules . Allowed to claim £20,600 a year in London rent and £150 a night for hotels . Mortgage claim ban forced them to let out second homes , MPs said .