short check to LHR is very tough considering you have 2hour transit, and considering baggage need to make it to terminal 5 on BA it is even harder.

option 5 is not the right option as savvy consumer, even it could be moral right choice. sending luggage from mnl shud cpst close to 250usd, i would think other options even 5th is cheaper than this.

best is reschedule your flight so departure is next calendar day to OSL as stopover apply if you stay longer than 24hrs.