An update: I went for Etymotic ER4XRs (imported into UK from B&H - price was good, v quick delivery and customs pre-paid for convenience). Sound with the SR25 is different from my previous Plenu D and AKG A50 so getting used to that but hearing new things! Nice.

Thanks for the suggestions!

Hi I'm looking for any recommendations for a pair of headphones for Astell&Kern SR25. - used for classical music (vocals and orchestral) - used in public places like trains so will need to have minimal sound leakage - portable (would prefer not to have full around ear style) - I've gone for...