Afloss I'm sorry to keep on about this. I am always mindful that when people read these threads its often because they or someone they know is in a very similar position and they open the thread hoping for some helpful advice. Which means when someone posts advice which is factually and/or legally incorrect, I do want to put that straight.
Firstly it's not clear that Triggles' DH's employer haven't followed their own policy. As I mentioned before, I would expect there to be a clause in the disciplinary policy stating that if they consider the offence to be serious enough, they can skip the verbal warning stage. They might consider this to be serious enough as ordinarily for this level of absence he would have previously had a verbal warning already. I'm not saying I personally think that would be reasonable of them, but they could say that and it would be perfectly within their policy.
Secondly, just because a company doesn't follow it's own policy, doesn't necessarily make it 'unlawful'.
Thirdly, he shouldn't jump in and use the grievance procedure. He will have been told how he can appeal this disciplinary decision and should do so if he wants to. In most disciplinary policies it will state that the decision of an appeal panel or equivalent will be final.
Fourthly, a small claims court wouldn't handle something like this, it would be an Employment Tribunal.
Fifthly, what 'case' do you feel he would have? What would he be claiming? He has had no financial loss, so what 'settlement' would they make?
We have not had any indication that Triggles' DH feels he is being discriminated against so he has nothing to 'claim' at the moment. In the unlikely event that he does something else within the next few months and is dismissed because he is already on a written warning, he might then have a case for unfair dismissal. But that hasn't happened. Even if Triggles' Dh decides to appeal the decision and doesn't actually succeed in getting it changed, the warning will expire off his record in (usually) 6 months anyway.
I am sorry to labour the point, but I do get a bit fed up with people on here and in RL at the first sight of anything unfair, leaping in and suggesting the person consider some kind of legal action. This is not America, where as I understand it, they are far more inclined to sue someone who blows their nose too loud causing them to drop their car keys down a drain, and similar ridiculous claims.
Even if Triggles' DH does disagree with the action they have taken, there is no legal 'case' and he should not be contemplating legal action because of this.
Once again apologies for picking you up on everything, but I would be concerned to think that someone reading this and in a similar position might threaten their employer with a case in the small claims court or similar.