Yes. If you are executor who obtained the Grant, you are executor for life, unless removed by the Court.
However, if the executor is considering taking court action to recover monies due to the estate, they should ask the beneficiaries if they consent in order to obtain protection on costs (ie and are entitled to take any unrecovered costs from the estate rather than bearing them personally). Given that the estate has probably been administered, the beneficiaries may have to contribute to a fighting fund.
Also you will need to consider limitation issues.