My initial thoughts are I am not sure that there is sufficient grounds under the F.S.O. to insist on this.I shall make some assumptions-that the dwellings are occupied as a 'domestic' premises,and if in a block of flats,seperated into their own fire resistant boxes with a 'stay put policy'.Therefore they may not be required as 'responsible persons' to cooperate, although they would have other responsibilities e.g. maintenance of their front door for instance.However, the landlords, they may insist on lease conditions which could require the testing.However-supposing an item fails-does the landlord have the power to either have it fixed or confiscated?or could it be a condition of the lease?A point of interest-my other half runs a Private Residential Care home,where all electrical goods are Pat tested,the residents personal items included,but not charged direct for the service (one would assume that the cost is absorbed into the general care charges),as part of the Homes H&S policy.Items not passing are not allowed to be kept.This is a condition of the care contract.I think some Hospitals operate a similar policy.