If you still sell the property but remain non-UK resident, then the situation is the same. However, if you hold on to the property beyond 5 October 2016 in the case of using the 5 April 2015 value as the cost, you may have some CGT to pay. The amount would depend on the sale price of the property. You ought to get a valuation of the property as at 5 April 2015 done.Unless you reoccupy the property before it is sold, you won't be able to claim exemption from CGT using the absence abroad rules.Tax rules can and do change over time.
The few months it woluld take to sell it. I wouldn't put it up for sale until you had moved back in, though that shouldn't matter.If I were you, I'd sell up whilst still being non-UK resident.