This Q&A looks at where a guarantor under a lease is not required to take a lease but rather pay a landlord a sum of money under the guarantee provisions in a lease, in order not to be a penalty and unenforceable, whether that amount should not exceed a reasonable estimate of the landlord's loss and would that be calculated by reference to the outgoings payable under the lease for a reasonable estimate of the time that it will take the Landlord to re-let the property.