1996 Bedroom tax loophole query

I have a client who has appealed the decision not to award an exemption under the 1996 exemption rule

The property the lived in, was along with a number of offers demolished and they moved into the new address in November 1996.

They had lived at the previous property for over 20 years; I believe these may be exceptional circumstances

However I have not been able to find any case law to support this argument?

Does anybody else know of any supporting case law?

As far as I am aware, a pass is only given in the event of fire, flood, explosion or natural catastrophe rendering the home uninhabitable. I couldn’t find it in CPAG at first glance but it is referred to in HB Circular HB A1/2014.

Welcome other thoughts.