PEL got bought up by Trutest at the same time Stafix did. Stafix branded energisers are still being sold by RD1, so the brand is not gone. Looks like the case design hasn't changed much in 25 years.
Yes, the Trutest group is certainly good competition to Gallagher....sorta forgot who is now owned by who.
Over the years we have had products from all of them and our current energiser was the 2nd largest from PEL when we got it a few years back.
We had the option to get the remote control for it but our layout stems from the days when such features were not available and has many pre-existing branch switches to simply isolate fence sections for fault finding and/or repairs.
For our switches we use old powerco pole fuses, the now rarer 1/4 turn glazed ceramic types. These don't give shocks in bad weather when wet like the flimsy commercial types.

Some years back I did some research into replacing aged pulse grade caps to give weak energisers a new lease on life and quickly found 900V ~40+uF pulse grade caps are a speciality product and IIRC a crowd in Rotorua was one of the main manufacturers but the cost.....

Now I have a selection of old energisers primarily for a small stock of their better pulse grade caps which I should really harvest and store and get rid of the old electronics.....then I should also harvest their SCR's but where do I stop !