The OP is in a slightly tricky situation here.
If the agent is this cavalier with safety, then one wonders what their attitude is to revenge evictions ?
If the OP reports this, then there are agents and/or landlords who will quite happily kick out the tenant using Section 21. Quite rightly, this has been highlighted as being bad, and that's why it's being planned that S21 will get the chop. As a landlord myself, I am in two minds about this - I have no support whatsoever for the ****s that do this and get the rest of us a bad name in the process, but on the other hand, it can be hard to get rid of truly bad tenants (even with S21) and that's going to get harder.
And it "annoys me greatly" that there are ****s who are doing this sort of thing. It's the sort of disregard for basic safety that got us into mandatory electrical checks in the first place.
I do have to say that the landlord could be completely oblivious to what's going on. I have a family member in a rented house which I'm fairly certain from cursory observation will not be without at least one C2 - AFAIK they've not had any EICR done. But they've been complaining for many months about a leaking roof which the agent won't get fixed - and they thing the agent has something of a reputation for hiding details from landlords. It could be that this agent is doing much the same thing, and the landlord is happily oblivious - just thinking that the agent is doing well at keeping the maintenance costs in check. But it could be that the agent is just doing the landlord's bidding and the landlord is just as much of a **** as the agent.