Thanks for posting on the forums in regards to taking our mobile service and the option for an eSim. Welcome to the community.
We do offer eSim's and more details can be found here and if you give the team a call on 0800 052 0238 they will be happy to discuss this with you in more detail.
Happy to help, sometimes via our site we offer deals where gifts are included. We have in the past included smart watches with particular handsets if that is something you look to do in the future. I have a Samsung S22 Plus and a Samsung Watch, it connects via Bluetooth and I get notifications for texts, emails, calls etc without the need for a eSIM. The caveat is that the handset and watch have to be within a certain distance of each other due to Bluetooth.