Not sure re the reference to doctor's surgery but the freeholder's address would be publicly available from Land Registry.

I can totally understand a landlord wanting to re-let the property if he's not getting rent and it looks unlikely that an original tenant is ever going to pay. It is a perfectly reasonable and understandable approach but it's a risky one, that's all. Sometimes the risk is worth taking but sometimes it backfires, as it appears to have done here.