I hold an Australian mobile with Telstra and recently travelled to the UK and Canada (Oct 2022).
I got Airalo as my first eSim experience and was connected within minutes of downloading the app to my mobile.
It worked throughout the UK, Newcastle, Edinburgh and Isle of Skye. A few weak patches here and there but compared to my husband's eSim with another provider, i had no issues whilst my husband didn't have signal outside any cities.
My next destination was Canada. I purchased some data before leaving the UK and was connected to Telus by the time I landed.
I definitely recommend it, although still expensive for small data load. Ensure you connect to WIFI whenever its available to save on data.
