There’s a datasheet out there but you have to be a radio museum member. This explains why it was in UK

 

I like the juxtaposition between these…

absolutely no idea what this is

The item may have some signs of cosmetic wear, but is fully operational and functions as intended.

 

There are those that collect Beanie Babies and then there are those that collect obscure radio tubes. For them, it has great value. Whoever snapped it for 5 pounds is very happy I would think.

 

Whoever snapped it for 5 pounds is very happy I would think.

Looks like something @Hypathia's Protege(HP) would bid on.