Craig.

My 4.2 had the exact same. I seem to get the impression that super charged and turbo charged vehicles are struggling with the e10 increased meth there fore as its using more fuel then what its used to it throws up the fault codes. Soon as you run super unleaded tesco momentum in my case, it's using the correct volume of meth therefore won't need to use more petrol and run lean. I've suggested to a lot of my friends that run on boosted cars too try this.

Another way too find out would be to fill a car up with e10 fuel and run this around while using live data so can see what the injectors are doing then look at what they did previously before the e10 change or try it on various forms of super unleaded petrol and re read the live data

Had a look at some of these octane boosters, some of which seem to aimed primarily at motor sport. One point I noticed is that most of them shy away from definitively declaring that the product is safe with catalytic converters and other systems. Therefore if I were you Sir, I would just top up when you have some room in the tank.
Especially as the boss's SC is probably in tip top condition Sir

Not an expert on this, JMC in the above post will most likely know a LOT more than me on this subject.

Interestingly, fuel crisis aside (not applicable in my neck of the woods anyway), the only fuel shortages I've seen here in recent weeks have been padlocks on the super unleaded pumps. This has been nothing to do with tanker deliveries and all to do with a sudden increase in super unleaded sales which has caught the retailers with their pants down. I wonder why.....  The older I get, the more I realise that people confuse wrinkles for wisdom

Swmbos Fiat seems fine on the new E10, but I’m not going to put it in my ‘98 M3, pretty sure that likes super best anyway….. There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
Fiat 500x 1.4 multiair Lounge 2015
2010 LR D4 Commercial 2.7 TDV6

I'm going to have to put the new stuff in mine, in the next week or so. It's going to be a case of sucking it and seeing what the outcome is. Not upset SWMBOs micra yet. Previous cars:
S-Max 2007-2013 (only diesel I've had, good car but expensive when diesely bits go wrong, so what's the point?)
Galaxy 2001-2007
Mondeo Estate 1997-2001
Sierra Estate 1993-1997
Uno Turbo 1987 -1993
Fiesta 1984 - 1987
Fiat 127 1982 - 1984

No expert here but I looked into fueling a long time ago when running an import Japanese spec. motor which would have been runnning on 100RON fuel back in Japan.

Ethanol is actually used to increase the octane rating, like other alcohols, and it's RON rating is typically higher.
You can get better performance out of higher Ethanol content fuels (like E85), especially with forced induction engines, because the resistance to knock is higher (higher RON). There are other performance benefits to as well..top fuel dragsters run on alcohol for a reason.
The problems with Ethanol are:

1) It's calorific value is less than standard gasoline, in other words it contains less energy. So to get the equivalent energy from it you need to burn more hence the fuel economy suffers. As we are coming from only 5% content to 10% content then the fuel economy difference should not be massively different, perhaps 5% at most. If you were switching to E85 from standard gasolline then it would be about 15% to 27% difference for example.

2) Ethanol is a solvent and is corrosive to metals although additive packs are included in fuels to reduce this. The Ethanol will clean out fuel tanks, pipes etc. and also can eat through certain seals and pipe materials although that really only affects older vehicies, in general, post '02 vehicles should have been manufactured with Ethanol resistant materials and post '10 vehicles should have no problems at all.
The cleaning nature of Ethanol can lead to clogged fuel filters fairly quickly early on, once the system has been cleaned through then it shouldn't be a problem. Lean codes could be the result of clogged filters or a previous near lean condition which the E10 has sent it over the edge into error.

3) Ethanol is hygroscopic, it has an affinitity towards water and will pull moisture out of the air. If left Ethanol will combine with water and separate out from the rest of the fuel. It is not recommended to use higher Ethanol content fuels in vehicles that are likely to be left for months on end unused as condensation can build in fuel tanks, especially if PCV systems are not sealing the tank properly, and end up with poor fuel with lower octane sat on a pool of ethanol/water underneath it. Given the fuel pump sits near the bottom of the tank I'll let you decide how an engine would run on it! For everyday use though it's not a problem, for over wintered garaged classics it might be.