You need to call O2 for an eSim pack.
Numbers here Guide: Coronavirus Community Help and Support
Advice from an O2 Guru regarding a way to get through:
If you call 202, when it comes to the reason you are calling stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say "Upgrade", "Lost/Stolen" or "Fraud" if you have to, to get put through to someone.
It may also be possible to get one from your local O2 store if they have any.
They open at 8.00am @ShazMob
Track usage, upgrade and get support with the My O2 appDownload My O2