It is standard that initially a notification will be sent to the tenant(s) as a reminder. If after repeated efforts, the rent remains in arrears, the guarantor(s) will be contacted and asked to pay.
If the rent remains in arrears, it is up to the individual landlord as to the course of action that they take. If the property is in arrears for over two months, they may decide to launch repossession proceedings via the courts. They can launch proceedings to recover any losses via the small claims courts. It is within the landlord’s rights to ask all of the tenants and their guarantors to pay any outstanding balance.