Peter, on the vast majority of cases, there is no "share" of the rent as such as joint tenants are jointly and severally liable for the rent. So legally all the tenants are liable for the full amount. If one tenant has left the property and can't/won't contribute, then the remaining tenant will be liable for all the rent. I think it is only a matter of time before the DWP are taken to the UT and lose on this.
