These Eldar starships on display at Warhammer World were for Battlefleet Gothic and were released in 1999.
Battlefleet Gothic is a miniature game set in the Warhammer 40,000 universe. It deals with the space combat aspect of the universe, and particularly the events surrounding the Gothic War.
I never got into Battlefleet Gothic as I much preferred using the GZG Full Thrust rules for spaceship battles. I also used MicroMachines Star Trek ship models.
There were some nice models for Battlefleet Gothic and as with many games that Games Workshop have produced over the years it’s a pity that it got retired. It is nice that they do put these kinds of retired models on display.