Just finished this trip.
1. Radisson was great hotel and as for the breakfast… wow.. and all for under £100
2. The return (back to back) Oslo flights. LHR-OSLO flight was 30 minutes late meaning there was no way I could go through the system as there was a good chance I wouldn’t be allowed to go back to airside, due to the timings.
However, British Airways found a solution.. many thanks indeed. All done and completed with absolute ease and no stress at all..