I suspect the decision you’re think of is CH/2957/2004 (reported as R(H)9/05). This (broadly) established 2 things:
A claimant can be treated as occupying the new property as their home even before they physically moved into it, provided that someone moved their belongings in for them and they had no-where else that could be considered their normal home.
The temporary absence rule can apply before occupancy has physically occurred – because the claimant can still have an “intention to return” once occupancy occured through their agents (i.e. the people who moved their stuff in for them).
This all sounds pretty similar to your case so these same principles may well apply.