Michelin-starred outlets set up by the celebrity chef, including the Fat Duck in Bray, Berkshire, face new uncertainty - with 130 staff at risk of losing their jobs.
London Fire Brigade was called to the incident at Middlesex Business Park on Bridge Road in Southall at 8.55am, with crews from Southall, Heston, Ealing and surrounding stations sent to the scene.
The culinary icon - who takes Wegovy himself - is looking at serving smaller meals at his Fat Duck venue and creating a slimmed-down menu for Britons on the weight-loss drugs.
The London-born celebrity chef, who holds a total of seven Michelin stars, was diagnosed with bipolar disorder after being sectioned - on the insistence of his wife - in November 2023.
The celebrity chef is teaming up with chef Alain Roux, who is also celebrating 40 years of his triple Michelin star restaurant, The Waterside Inn, Bray.