I sent an email to them and this was their response (South Africa)
Bovril is a blend of Beef & yeast extract
The yeast is derived from spent brewerβs year blended with beef extract
The thickener which is used in Bovril is not oxblood; it is derived from carrageenan, a natural ingredient made from seaweed
Bovril is Bovril is not certified Halaal and Kosher due to a component in the beef extract which is not Halaal- and Kosher suitable.