I am seeking to introduce a candidate to a multi million pound law firm and I am tongue tied can anyone help me with a template?

I would suggest checking out the answers and subsequent links on the following link. What you find in the links may give you ideas for an outline.

https://www.askmehelpdesk.com/technical-writing/sample-letter-introducing-upcoming-magazine-96215.html

https://www.askmehelpdesk.com/other-business-careers/introduction-letter-64801.html