If you cannot find a Will in any of the paperwork at the property, you should speak to other family members or loved ones to see if it was left with them.
You could also contact any local Solicitors that were used by the person who died to see if they have any records of a Will being made or in fact have the Will.
You can also check with the Probate Service to see if a Will has been registered there by writing to the Principal Probate Registry in London. If you find a Will, it will need to be sent to the Executor/s.
Some companies also offer Will searches for a fee.