I expect that the more Morrisons looked at the stock, building, fixtures and fittings (including fridges and freezers), the more they realised that they need to start from scratch.
I reckon they will also re-configure the car park with spaces marked out in a more efficient and pretty way (eg. colours for parent and child, disabled etc).
Gutting the place, re-roofing it and fitting out from scratch will take at least 3 months, but allowing for holidays and delays, 4 months ......... hence it will take all June, July, August and September.
Must look on the bright side: We will have a brand new Morrisons with all its proper fixtures, fittings and stock ..... and the freezers will work and the roof will not leak.
Also, the staff will be good as new ........ ie. properly trained. No doubt a few will not make it through the training, but most will.
Personally, I think it will all be worth the wait ...... and Co-op and Tesco Express will do really good business in the meantime ......
I am confident that Post Office Ltd will arrange for a temporary PO in the town centre. They have been talking to the right people to arrange this. However, there is a chance that there may be no PO at all for a week or so if the temporary PO takes longer than hoped to arrange.
Fingers crossed that it turns out OK.