Keen to know, once I’ve paired my IKEA Tradfri devices through the Hue Bridge, will they appear in the Philips Hue App as well or can I only control them through the Hue Essentials Application?
Yes, they will appear in Philips Hue and you "ll be able to control them.
Thanks for confirming, now I just need to work out how to get them to pair with Philips Hue (separate thread)