We check this website, now sciencemuseum.org.uk is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is sciencemuseum Down Right Now? - NO! sciencemuseum is up!
If you have problem with access to site sciencemuseum, and domain sciencemuseum.org.uk is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).