I think due to the sub-optimal LBA-LHR timetable you might have trouble booking a suitable LBA-LHR connection to be able to get the flight you want to ICN (unless you are happy doing an overnight at LHR).
The taxes & fees for LHR-ICN are indeed £352 but MAN-LHR-ICN return will only be £409. Do a dummy booking and if you see a higher figure when selecting your flights, click through to the next page and you will see the correct amount.
Last edited by tigertanaka; Jun 12, 2019 at 7:21 am