no - no connection with the Roux brothers who run the Gavroche in London (near Hyde Park) and the Waterside Inn (still Michelin ***), about 20 minutes by taxi from Heathrow.
When I was at the Gavroche in London with Gisela (15 years ago?) she wanted to take a foto, but the chef de service stopped her and explained later, that some other people (in company with whom? guess?) would prefer not to be intimidated ...