[GH85Carrera]

Watching the F1 race and hearing different British speakers I have heard the phrase (I think) that is "give it some Wellie" for going faster. What is the exact phrase and what is the derivation? Or where does it really mean? I hear the term from Mike Brewer on Wheeler Dealers a lot.

Also I heard the announcers for the F1 race, all of whom are British speak of the "Union Jacks" which is obviously the flag. I have heard the term but I heard one long impassioned comment that it is only a Union Jack when it is on a ship in the British Navy.

I have to assume three British announcers (even if they are for a US broadcast) know the correct term for a British flag.