A bardic lamp is a standard hand signalling torch. Over the years they've been used by the fire brigade and the military among others. They're not exclusively railway kit. You can't do someone for bringing a torch on the railway, although if they were using it to maliciously signal to a train I believe it would be a different matter legally.
As for T keys, you don't need a t key to open any lock on the train. It's a square bit of metal. If anything, TOCs and ROSCOs should be taking a more proactive approach and fitting something more secure than a little hole to keep things safe - as some companies have done!
T keys have been around for 200 years in various forms and the idea of them being exclusive railway items is again laughable.
BR01 keys and the like have again been around for 50 years. They're not secure and they should not be used to secure something safety critical against tampering. There must have been millions of them cut over the years.
We do use S&T keys such as the 221 on the GCR - and they're issue only. Only the senior nominated S&T managers can issue them to anybody and they definately don't get handed out willy nilly. I've never seen one for sale anywhere either as far as I know.
And on the occasions I've travelled around on the network in my uniform with my kit on me, I've never had any trouble from any rail staff, in fact many of the closet cranks usually see it as an invitation to come and have a chat about their interest. If required I've got my grade ticket and photo ID issued by a railway that's HMRI approved to show that I need what I have to carry out my duties. And that does include bardic lamps, a T key, a BR01 key and various other things.