SIN is well known for being a good airport for transits.
But the OneWorld ground staff there are also on the ball when things go wrong. They are extremely efficient.

I missed the BA12 SIN-LHR flight, due to delays with the QF37 MEL-SIN incoming flight.
No dramas at SIN, though! Myself and a dozen others were greeted on the off ramp, swiftly informed of our rebooked itineraries, swept through immigration and straight on to a coach to a really nice hotel near Orchard Road in central Singapore.

There I had access to complimentary meals and room service. And the final touch was the hotel staff handing me 35 dollars in cash at checkout, for a taxi to Changi airport.

This far exceeded my previous experiences when missing a connection. And I was travelling in Economy and don't have status.