Good morning,
Although not surprised I find this troubling.
I have looked at the SLR 8.9 and I couldn't workout if it had an aluminium, steel or carbon steerer, at £1K a carbon steerer seems possible.
The SLR 8.6 claims a full carbon fork at under £600 for the whole bike.
I also see that Halfords did include the torque setting for the stem, but instead of being reassured I find that as worrying as the stem not being tightened. Did they fill in the standard Boardman value of around 17Nm which is the value for aluminium or something in the 4Nm-6Nm range for CF, if indeed the steerer is CF?
If the stem wasn't tightened as ticked, then it is hard to argue convincingly that the torque setting on the same form must be correct.
I am not very familiar with carbon bikes, but I know enough to know what I need to lookup, so I bought a torque wrench for doing up my stem as it specified 5Nm and that is not a lot more than finger tight.
But I would have a lot of sympathy with someone finding their bars lose and then doing their aluminium stem up to 17Nm on a CF steerer cracking it in the process, hopefully. I say hopefully because it would then be obviously broken, rather than breaking during a ride.
With a CF seat pin it is obviously something not metal, but the steerer is hidden and if you are not expecting the need to check then you wouldn't. I can easily see some customers of Halfords or an LBS being unaware of the very low forces needed to bolt a stem to a CF steerer as it is counter-intuitively low, especially if they have a sheet confirming experience and expectations of a much higher force.
Bye
Ian