Assuming the delay is three hours and that it takes eight hours to fly to Singapore, stop over for an hour and a half and fly 14 hours to london, the total travel time is 26.5 hours.

London follows GMT, which during normal time is UTC+0 and during daylight saving time UTC+1. Assuming you start from a place which follows UTC+8 and travel for 26.5 hours, the clock time will be 8 hours less or 7 hours less respectively, so either 18.5 or 17.5 hours less.

If you start your journey no later than 5:30 a.m. or 6:30 a.m. respectively you will arrive at a Saturday, otherwise you will arrive on a Sunday.
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