Lack of partition wall in loft

Hollie161090

Hi, I'm about to buy a buy to let property via auction (it didn't meet its reserve so we are currently negotiating directly) and have discovered there is no partition walls between the terrace properties in the loft. I've been told this will render the property 'uninsurable' as it nullifies any policies, as well as making it unable to let? I need to act quickly but not sure what to do, its only a small cottage but read it could be 10k to rectify, not including the fact water tanks need to be moved as they are on the boundary wall for each house... I have no knowledge in this area so any help is much appreciated.  Many thanks. 

plumb1_2

There’s hundreds of thousands of houses like this. It’s the way they were built in Victorian times etc. And are insurable 
Very easy to build a fire wall, use metal stud (gyproc) and fire proof plasterboard. And apply fire proof sealant/foam around the perimeter. I did one about 5 yrs ago, dirty job. 

You might have to make the loft hatch bigger to get the boards through, just cut a 8x4 in 2, length wise.
As for tanks that them out and fit a Combi