A little off from the OP but looked at 3 rented houses yesterday in which the landlord want EICRs done on them. He has also asked about putting in mains smoke alarms, so I will be quoting him for these.
My question is regards interlinking. There is no way at the minute to go installing cabling to interlink them and I reckon the price of RF bases will kill him.
So do you reckon its a good idea to install the alarms for him, but not interlink them, then when he feels hes willing to let me or someone back to get the interlinking sorted he can do.
My thought is the mains smoke that are not interlinked are better than none or the old knackered battery ones he has now with the batteries removed.