BMW, which has a plant in Oxford, warns ministers it could be forced to leave the UK if there is no transition deal with the EU.
Sgt Mark Allmond was off duty with his family when he stepped in to help.
People in the area described a "horrid" smell and said smoke could be seen for miles.
Readers' snaps sent to us
A collection of stories and videos from the week
Championship side Blackburn Rovers sign midfielder Joe Rothwell from League One Oxford United on a three-year deal
League One side Oxford United sign Sheffield United midfielder Samir Carruthers on a season-long loan.
About these results
The Big Oxfordshire Quiz
Meet Bucky, whose life was saved by a dentist
Sign up for our newsletter