Unfortunately if the property is managed, the landlord has in effect paid for anonimity and therefore have hired Foxtons to act as a mediator on their behalf. Perhaps in this case they cannot get hold of the landlord to get his permission to provide his details to you. What you should try to do in future, whether the property is managed or not, is get all the landlord's contact details yourself before signing the contract as the management department will not alway be realiable to have gathered all this information in order to get hold of the landlord, which, especially in times of emergencies, is absolutely paramount to obtain.