I gave up trying to understand the history of the company but it looks like it split before recombining with the American "Eveready" corporation in 1986, until then the UK division went by "Ever Ready". I assume that eventually the UK rebranded to "Eveready" but I don't know when this occurred. If we knew that it could narrow down when the torch was manufactured (until they stopped making this model or they updated their injection molds with the "Eveready" logo).
So it's possible this is legitimate merch sold in the UK in the 80s.
I did find one forum thread with a photo of what seems to be this same torch model:
https://www.vintage-radio.net/forum/sho ... tcount=191
(Post 191, the fifth photo attached).
Interestingly the poster is from the UK. Unfortunately he doesn't give any details on where/when he purchased it.
Update: it looks like Ever Ready UK did make Ghostbusters II promo torches:
https://www.ebay.co.uk/itm/154973874576 ... Sw7JNibnT7
And it still has the "Ever Ready" logo, which means that they hadn't yet changed it by 1989.
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