The company was closed more than 6 years ago - such companies are not in the API / Beta dataset.
WebCHeck for 05094746 says "Status: Dissolved 02/06/2009"
See this post:
"As an interim measure, we have taken the decision to not make information on companies dissolved more than 6 years ago available on the new CH beta service. We apologise for any inconvenience this may cause."
I filed a request for improvement so that there should be some kind of indication that data is missing, rather than no difference between "data removed" and "never existed". Don't think this will change though.