Mel Stride, a lawmaker who chairs the Treasury Committee in the lower house of parliament and had criticised Scholar's departure, said the appointment would help reassure investors.
The moves came as Kwarteng prepared to head to Washington this week with International Monetary Fund criticisms of Britain's new policy direction ringing in his ears.
British Chancellor of the Exchequer Kwasi Kwarteng speaks during Britain's Conservative Party's annual conference in Birmingham, Britain, October 3, 2022.
Kwarteng said the new date for his medium-term fiscal statement would give the independent Office For Budget Responsibility (OBR) enough time to carry out a full forecast.
The new date for the fiscal plan leaves Kwarteng and Truss with little more than two weeks to settle divisions in her cabinet over cuts to government spending.