So a driver doing 85mph (a speed you just happen to feel comfortable doing) should be let off, but one doing 88mph (a little too fast for you) should be stopped. Any other laws you'd like personalised while we're at it? Perhaps people shouldn't be done for shoplifting if they only nick stuff you like.
OK, sarcasm aside - we can debate until we're blue in the face about what constitutes a safe or unsafe speed on the motorway, but the thing is...it's not up to us! There is no "socially accepted speed". The law decrees Thou Shalt Not Drive At Over 70 mph, so if you do, you're liable to get a ticket. Yes, some county police forces may be stricter than others, but you really have no-one to blame but yourself for getting caught. I speak as someone with 6 points on my licence, so I'm not being holier than thou - but those 6 points were nobody's fault but mine. They are due to come off later this year, and I'm looking forward to having a nice clean licence again...I've learned my lesson.