It's possible that you may have heard her speak with a slightly different accent at some point, but this is likely due to a number of factors such as:
* Imitation: Singers and actors sometimes adopt different accents for specific performances or roles.
* Regional Variation: Even within the UK, there are different regional accents. It's possible that Sandé's accent has shifted slightly over time.
* Misunderstanding: It's possible that you misheard or misinterpreted her accent.
If you can provide more context about when and where you heard Sandé speak with a "different" accent, I might be able to give you a more specific answer.