Three times, in over 30 years of driving, I've been rear-ended. Each time my car was a write off but, like you, I always keep a safe distance from the vehicle in front. If anyone gets too close, I just gently ease off the accelerator, never dab the brakes or brake sharply. Eventually they will overtake and speed off down the road. I sometimes wonder if I would stop if they were involved in an accident further along the road. Possibly, possibly not.Having been rammed, 'Rear Ended' in the past I'm very wary of drivers who get close to the back of any vehicle I'm driving (or in). Anyone who gets close causes me to slow down. I'll certainly not help them to overtake and in heavy traffic I leave a greater distance in front of my car than I usually do.
For you, with a clean license, you have a good chance to be offered a driving education day rather than fine and points on your license.