Dear FT members, would you guys give help and advice?

I've checked SQ business class price between Munich and Manchester and found good cheap fare for flight about 2 hours and 15 minutes.

I am an Indonesian and also hold a Norwegian Permanent Residence Permit. I have read on UK Immigration website that one don't need any visa to enter UK if one hold a EEA countries permit, a confirmed ticket to next destination for example Oslo, and leave the UK no more than 24 hours after arrival.
The source is here :
https://www.gov.uk/government/publications/changes-to-transit-visas-immigration-act-2014/changes-to-transit-visas

My question is how to explain this rule to SQ check-in agent in Munich? I am afraid that they will deny me boarding. Maybe I need to print the information about the visa above and show my confirmed flight out of UK? Or any advice?

Thank you so much, in advance