Some new drivers put the green 'P' plates on their car for the first few weeks after passing their test, so most drivers are more forgiving if you make a mistake......but you will of course still get some more experienced or impatient drivers who show off to prove how much better they are at driving.
They are available in Halfords: Halfords | Halfords Multifix P Plates
"I bought these P plates for a friend with little driving experience and thus not much confidence. The plates were easy to attach to the car using the adhesive strips, and more importantly they have the desired effect that other drivers are more patient and considerate, making driving much less stressful for my friend. Definitely a useful accessory for anxious new drivers."