Before the 4 April 2024 rules change Skilled Worker visa holders were only permitted to undertake supplementary employment which was the same type of work as their main role.
As there are different job codes for research and university teaching this meant that a Skilled Worker visa holder in a research role was only permitted to undertake teaching activities (giving lectures, tutorials, examining, or invigilating, for example) if their role also included teaching within the collegiate University. A Skilled Worker visa holder in a research only role who wished to undertake teaching had to ask their employing department/ faculty/ college to submit a request to SIT to report the new teaching duties before any teaching commenced.
Now that Skilled Worker visa holders can undertake supplementary employment in any type of work which could be sponsored under a Skilled Worker visa there is no longer any need to report teaching as an additional duty.