So, OP has done some preliminary research and is able to say that the listed owners are deceased.
thedaddyman's suggestion is probably best.
Is there anyone living in the house? Is it conceivable that there is no next of kin? As 44brendan suggests, you could do a probate office search and see if anyone has applied for a Grant. And, if so, requisition a copy.
It can happen that property is simply left with no-one paying any attention to it. The one thing guaranteed to flush out an owner or someone with an interest, is to start exerting acts of ownership over the land/ property - e.g. put up a fence, a gate, change locks etc,etc..
mf