I have a Norwegian travel document and would like to travel to London- England for 4 days. Do I require a visa?
The answer depends on the purpose of your trip, but assuming a tourist or business visit, the answer is yes, you need a visa, as you can see from the government's visa checker.
You can check if you need a visa using the tool available on gov.uk https://www.gov.uk/check-uk-visa/y
Selecting ‘Stateless or refugee’ and assuming you’re travelling alone for tourism the answer is yes, you need a visa.