Coupleof yrs ago I got flashed at 57mph in a 50 area as the driver was on my bumper.
3 points later and £65 fine in the post-I learned to ignore the driver on my bumper.
Ignore the idiots-anyway concentrate on your driving!
Besides it could be an emergency-they have reasons for speeding-if it's serious/life threatening call the cops to get there for you-don't risk yourself or others!
If you're just late then you speed you get caught or crash into someone or arrive a few minutes earlier.-Someones life isn't worth it and workmen could get runover.