15mm.co.uk also has some new Mutant Creatures if you want mutants and not aliens.
From the release:
Interested in more creatures for you 15mm gaming? Look no further than this pack which contains seven different miniatures mixed of the four you can see here.
A tentacled brain monster, a mutant gecko, an eyetaran and a thing of the abyss.
Great value at only 4.00GBP per pack and suitable for many settings from the far future to a radioactive wasteland. Bases not included.