UK media is rather parochial - this is probably a "First in the World" event that only qualifies when you realise it is the "First time in the World that this thing has been done by someone from the UK".

The local site - it is an international trial started 25 Oct 2023 and is still recruiting. https://findastudy.uclh.nhs.uk/trial/661035dfbf51030ec062e8f...

and results are expected in 2029, absent any meaningful interim analyses. https://www.fiercebiotech.com/biotech/merck-moderna-post-pha...