Atti is right.
Get a copy of the registered title (you will need it anyway).
Check whether there is a restriction on the title preventing a sale by a sole surviving owner. It is likely - but in now way a given - that the house will have been held with such a restriction, making it a tenancy in common. It is such a big question that it it is not worth going further until you know.
If it is a tenancy in common then _after_ the grant is obtained, the administrators stand in the shoes of the deceased tenant.
If there is a tenancy in common then there is somewhere a deed or scheme of trust under which the trusts of the arrangement are established. This may possibly include restrictions on a sale.
All that apart, when you swear the oath, you will promise to 'collect get in and administer according to law' That means an obligation to turn everything into cash. There is a limited scope to delay a sale, but no jurisdiction to begin a letting business.