@Rob1257: Updates are rolled out in batches, and will reach some users sooner than others. Please ensure you have auto-updates enables via Settings > Software Update > Auto Download Over Wi-Fi (On), and Settings > Biometrics and Security > Other Security Settings > Security Policy Updates (On) to allow you to download the update as soon as it becomes available to you.
As @Pugs1957 correctly states, that is BS.
The 3rd June build dated the 9th June, was released for non carrier branded devices on the 17th June on a staged roll-out and was available the 21st June for unbranded U.K. devices.
EE network devices on CSC code EVR, were quick to certify it for release on the 23rd June and followed by O2 devices on CSC code O2U and Vodafone on CSC code, VOD.
There can be no reason for Samsung when they have received certification for carrier branded firmware, from the carrier, to withhold it.
This has been going on for a decade, since the Galaxy S2 days. Three are either tardy or have added/amended their bloatware.
This is one of the long standing drawbacks of opting for carrier branded devices I am afraid... since you are at the mercy of those carriers.
Those in the know in the U.K. and worldwide, opt for non carrier branded, stock Samsung devices. Samsung, CarphoneWarehouse, Argos and Amazon, as well as others, stock these in the U.K.
Samsung actually released three June security updates.
AUE8 released 31 May 2021
AUF2 released 7th June 2021
These were only partially rolled out and were pulled by Samsung.
AUF6 released 17th June in a staged roll out.