I didn't understand that, either.
("Minor" speeding tends to be £100-200, three points. "Serious" speeding goes from £100-1000 and/or 1.5 weeks of the the driver's take-home, 6 points and a period of disqualification. To me, the facts point at "Serious". Being caught by a speed camera removes the "was observed driving dangerously and failed to stop when chased" aggravation, but... come on... 166% the posted limit? Or 142% the maximum possible limit, if claiming bad signage/temporary misunderstanding (and perhaps having temporarily forgotten that it's only dual-carriageways where that applies if this was on a single-carriageway road).)
Mainly, though, I despair of there even being the possibility of any reason to consider 'being distracted' as a mitigation. If anything, a lack of focus would be an additional reason to not been going anywhere near as fast...
(Cards on the table, I've driven at 100mph. Reckless youth. You know you're doing it. I didn't go for long in that mindset, having avoided the obvious karmic fates that would stem from it. Further card on the table, I once mistook a 30-zone for a 40-zone (it was actually a 'safe speed' to do, but not what the road was designated at) and got pulled over for it (clearly somewhere where such mistakes happen often enough to make it worth checking for errors such as mine) and had to graciously accept the points/fine for it. And I'm the kind of person who will drive at the speed limit (near as my speedo allows) when it is safe to do so and yet still get others moving up on my bumber/passing at speeds that can't even be possibly reasoned as just us have differently-adjusted speedos. The philosophy of some people seems to be "they maybe allow a 10% overspeed, in case of the speedometer showing slightly lower than it should, and I'll go another 10% faster than that, to take up the slack, in case my speedometer is actually showing slightly higher than it should". That's if they're even trying to rationalise it.)