It appears that the Samsung Galaxy A34 One UI 6.0 beta update has started rolling out in the UK after the Galaxy A54 got it in South Korea. - SamMobile
Galaxy A53 get Android 14 One UI 6.0 beta update
A34 5g one ui 6.0 beta available - Samsung Members
Confirmed List of Galaxy Phones to Get Android 14/ One UI 6 - Tech
Galaxy A34 is now getting Samsung's One UI 6.0 beta
Galaxy S23 One UI 6 (Android 14) update expands to more countries
Samsung to release One UI 6.0 Beta-based Android 14 update on July
Samsung One UI 6.0 beta based on Android 14 is scheduled to launch
Samsung Galaxy A34 Joins Android 14 One UI 6 Beta Program
Samsung Galaxy A34's Android 14 (One UI 6.0) stable update expands
These Samsung devices have received One UI 6 (Android 14) beta
One UI 6.0 Beta is now also available for Galaxy A34
Samsung One UI 6.0 Update List for Android 14 [Samsung Android 14