PetrolDave

That's normal behaviour, the Battery Management System tries to charge to battery to 80% SOC so when it reaches that the voltage will drop - until you get onto the brakes when it will go into micro-regenerative braking mode and increase the battery voltage. In normal driving I see the battery voltage go to 14.x after starting then drop to around 12.x for most of the time when driving, but increase again to top up the battery and when braking.

What do you see when you scan module #19? Anything showing under the Battery Monitoring Control Module J367 that is a subset of #19?

Does any reason for start-stop not working show up on the infotainment screen? There's an option to see the reason, I think it's under CAR?

The first mobile I designed was an analogue TACS phone, which predates any of the digital GSM/CDMA ones.

Blah blah waffle - typical dealer nonsense!

They're right that 2015 was a transition year, early 2015 builds had a MIB1 which cannot have Smart Link, later builds (like your it appears) have a MIB2 which can have Smart Link enabled. The key fact that Marshalls seems to have missed is that you have a MIB2, which means there is no doubt about being able to enable Smart Link and all they have to fdo is order the VIN specific key for your car.

Which surely makes the ULEZ zone and expansion fairly pointless as it won't be tackling the biggest source of pollution from vehicles?

This has been known and posted on here since at least 2016 when I purchased my first Octavia - it didn't have memory seats so I had the same lack of success when I tried to setup mirror dip on reverse. My current L&K Octavia has a memory drivers seat so mirror dip on reverse works perfectly. IIRC @SashaGrace discussed this issue at length as one her many retrofits.

I wouldn't agree that loose covers/trim isn't the problem, because what you describe sounds like a loose piece of trim or cover to me - that's fairly tight so it only vibrates when the vehicle speed is high enough for the airflow to make it vibrate.

I would suggest that 20-30 minutes would be a time many (most?) people would find acceptable.

Is a 2015 A5 Haldex or Torsen? A4/A5 quattros were originally Torsen but changed to Haldex to reduce emissions, but I can't remember what model year the change was made.

That's not true of all new cars, the Toyota I ordered new in 2020 came with a space saver spare and I quickly discovered that there WAS room for a full size spare which I duly purchased.

The best answer is to take the car to a mechanic who understands mechanics and is not just a 'keyboard jockey' with a diagnostics tool. Diagnostics only cover parts of the car managed by electronics, and that excludes nearly all of the mechanical parts.

The bodywork is the same, what is different is the foam liner which either accommodates a space saver spare plus tools or a container of sealant gunk plus tools.

Be better to have a video of the engine itself with the bonnet open and the engine running

Some still do have spare tyres.

... and Vodafone.

There should be a label in the fuel filler flap that has recommended tyre pressures based on tyre size and car occupancy.

If there is currently no 4G coverage where you live then it will fallback to 3G even if the SIM is 4G capable - I suspect this is the case where you are, it's certainly true for much of rural Wiltshire where I live!

You say blue smoke, but that picture looks like white smoke to me? Can you post a link to the video?

Check the Winter Tyre speed limit setting, which you will be able to access using the infotainment screen under Tyres.

I've been on Octopus Agile for about month, on some days when there is excess renewable generation the cost per kWh at some times is even negative (i.e. Octopus pay you for using electricity!).

Your details say you have a Fabia Elegance cr 1.6 - maybe worth updating them?

Weeping is normal but leaking to that extent is not, both Skoda dealers don't seem to understand the difference