Name That Trauma :: Reader Susan G. on a Possibly British Blob-Like Monster

This is what I remember.

In the late 1950s, I went to the movies with my older siblings; was dumped, so they could go off with their friends. I watched this movie 'alone' in a theater with a crowd of people:

Group has built a rocket, to go to the moon. There they will build a moon base. This base has several domes. Funds are cut. Project canceled. Ordered to shut down. Small meteor-like rocks are seen falling to earth on their radar. Investigation finds that the rocks explode and an alien gets inside the human and kills or takes over their body. Further investigation finds an identical moon base has been built on Earth. It is call a soup factory. Humans who have been taken over by the alien run this factory. They give tours, where humans are thrown into a vat to feed the alien, who looks like THE BLOB. Group with the rocket blast off the rocket to destroy the alien in the 'soup factory.' The base is destroyed, but, THE BLOB-like alien is set loose. It terrorized me. Finally it was killed. This movie was set in a country where the police sirens sounded like "it was Great Britain."

So did I image this? Is it a combination of scary movies I saw, that I did not want to see? I have searched for this film. I don't have nightmares anymore, BUT I did for too many years. Can anybody help me find the name of this film?

Thanks,

Susan

UPDATE: Name That Trauma SOLVED! Special thanks to Reader Senski for knowing that this Blob came from 1957's QUARTERMASS 2.