Yea… like I said, unless the flight delays such that you have <1hr once you deplane (and possibly as low as 45mins if you hustle), you should be fine.

Per FlightStats, 8% of MH3 flights (5 of 61) were ‘excessively delayed’ or cancelled in the past 2 months:
https://www.flightstats.com/v2/fligh...ating/MH/3/LHR

[EDIT]
Actually, what is the JL flight you’re taking SIN-TYO? If it’s JL36 at 10:25pm the day you’re supposed to arrive in SIN @10:20am (or an even later one), that’s 10hr+ of buffer, no?

That’s important info here, your length of buffer: expecting LHR-KUL-SIN is a single ticket, if you miss MH611, MH will reschedule you on a later KUL-SIN flight. 10 hours means you could still fly at least 4 other flights (depending on the day):

• MH627 @ 10:50am
• MH603 @ 11:50am
• MH619 @ 2:20pm
• MH625 @ 3:50pm
• MH613 @ 5:20pm
• or even MH607 @ 7:25pm (arriving 8:35pm is doable, esp. if you check your luggage through to HND, see here)

and still make a JL flight departing SIN at 10:25pm.
(Or just book your KUL-SIN flight for MH627 or MH603 for an extra 1-2 hour buffer in KUL itself…)

You then don’t need to worry about delays, just about your MH3 flight being completely cancelled.