I noticed that too, the E450 was the same, but the estate never reached here, just got the E43 which only offered black interior at the time and too over damped for what I wanted.
Whatever the terminology was, Super, Super Plus, Germany said to use 99ron, where as the UK just said 95.
I made a few posts about it with screengrabs from the Mercedes UK and DE websites.
It also hated Sainsburys fuel too, If I filled up with Sainbury's fuel I would drive from Norfolk into Cavendish Square, back of Oxford Street, and on the way home as soon as I got onto the M11 and put my foot down it would throw an engine management light. When scanned it would show an o2 sensor pre cat error and an error saying that the car had unknown additives or been misfueled.
It took me a few months to realise it was only when the Sainsbury's fuel was used.
Because of this I did some testing with this, Shell Super and Tesco 99, put the car on a rolling road, first with the Sainsbury's fuel as that was already in it, then with Shell and then the Tesco 99, all had at least 3 tanks and looked at the difference.
I can't remember the exact figures, but I think it was 304hp for the Shell and 306hp for the Tesco 99, so almost identical, where as the Sainsbury's super was 280 something.
I never used the Sainsbury's fuel again and over the next 18 months or so never got the EML come up. The guy who bought the car from me drove back to Wales and messaged me a few days later saying the EML had come on, and Merc said it needed new o2 sensors, I asked if he had used Sainsbuy's fuel and he had. I explained the above and you could just tell he thought I was trying to fob him off. Never found out if he ditched that fuel or paid Mercedes £900 for two new sensors.
I even spoke to techs at Mercedes as this was a pain, in Germany they had a software upgrade to adjust NOX sensor sensitivity. Mercedes said that loads of NOX sensors fail and they have to replace them weekly. I tried to explain they are not failing they are just too sensitive, but, as always, fell on deaf ears.