This move signifies a crucial step in the luxury car maker's recovery following a major cyberattack that had halted all production since early September.
JLR has launched a new financing scheme to aid struggling suppliers, offering upfront cash payments and paying them up to 120 days earlier than standard terms.
Adrian Mardell, JLR's chief executive, confirmed the phased restart of engine production and vehicle manufacturing, stating that the company's recovery is firmly underway.
The Government previously underwrote a £1.5 billion loan guarantee for JLR, and experts had estimated the production shutdown could cost the group around £120 million.