When i looked into leaving a property unoccupied i found for home insurance to still be valid,its just a perodical visit is required.
Which means ,well depends on your policy wording but unless there are special requirements for unoccupied homes in your policy,its just a visit every month,to carry out security and maintenance checks. check doors/windows locked,no visable water damage/water is turned off at mains stop **** etc.Keep a list of what you do dated.
In the event of an insurance claim you would need to prove you visited the property on a regular basis,so when you visit buy a carton of milk and a snack from a shop as close to the unoccupied house,keep the receipt and pay with your debit card,this is then your record of visiting.
Just to add,when I sold my last property it was unoccupied and cleared of furniture for a long time and during conveyancing the buyers solicitor at the very last minute kindly added a rider to the sale,rider (condition) was to withhold £10k as that I have not lived at the property for a very long time and not complied with my dutys as a house holder.
So I told the buyers solicitor if you need me to prove I have complied with the dutys of a house holder,then I will increase my sales price by £15k. I had receipts as above so I would be able to prove my case.
The sale went ahead at the price I wanted.
Good luck.