Mate, sorry you’ve lost your job, it must have been a real hammer blow after 4 years
Good you have found work, It takes the sting out of the thing.
Given that much of the training by employers is a box ticking / arse covering exercise. I find it a bit weird, they’d let you skip training sessions.
I’m working as an electrician’s mate and I know what it says in the EWR regarding working live.
How would you go about proving it would be unreasonable to lock off and test to make sure it’s dead.
What makes your case more serious is that you weren’t taking any risk yourself, you were telling someone else to do it.
Was your dismissal unfair ?
Get legal advice from a solicitor specialising in employment law. You could get this from the CAB
The CAB has changed a little bit, solicitors will give you free advice, the pay-back for them is; leads for fee paid work. It’s a little bit like ambulance chasing.
To get credible advice provide the following.
Suspension notice, and Invitation to the investigation meeting.
Notes/recordings, and Outcome letter from the above meeting.
Invitation to disciplinary meeting.
Notes/recordings from the disciplinary meeting.
Written Outcome of the disciplinary meeting.
Appeal meeting invitation, Notes/recordings and appeal outcome letter.
Any evidence your ex employer produced against you with , eg not hearsay - hard evidence.
A word of caution, outcomes of employment tribunals will come into the wider public domain.
You must decide if that would help you, with the 4 year hole in your CV and moving on.