Ground 1: that the landlord used to live, or intends to live in the property as his only or principal home.
Ground 2: that the mortgagee is claiming possession. NB this can only be of use where the mortgage predates the tenancy.
Ground 3: that the tenancy is a holiday let and was previously let for a holiday
Ground 4: that the tenancy is a student let and was previously let by an educational establishment to students
Ground 5: that the property is held for use by a minister of religion
In the above cases a court will require that the landlord has served notice of the respective ground on the tenant prior to or at the beginning of the tenancy. However, for grounds 1 & 2, a court has a discretion to dispense with this requirement if it considers it just and equitable to do so. A number of other grounds are also open to the landlord:
Ground 6: where the landlord intends to redevelop the property - a mandatory ground
Ground 7: that the former tenant has died (unless there is a person with a right to succeed) - a mandatory ground
Ground 9: that suitable alternative accommodation is available - a discretionary ground
For rent arrears, you can relying on either one or a combination of grounds 8, 10 and 11.
Ground 8: that the tenant owed at least two months rent (in the case of a monthly tenancy) both when the landlord served notice that he wanted possession and still owes two months' rent at the date of the court hearing. If the rent is payable weekly, quarterly or yearly the ground requires that there are rent arrears of eight weeks, three months and six months respectively.
Ground 10: that the tenant was behind with his rent when the landlord served notice that he wanted possession, and when he began court proceedings
Ground 11: that, even if the tenant was not behind with his rent when the landlord started possession proceedings, he has been persistently behind with his rent.