Would anyone happen to have a source on who portrayed the young Lady Eddison in The Unicorn and the Wasp? I’ve checked IMDb, Wikipedia, fandom, Shannon Sullivan, and a few sites I wasn’t previously familiar with. Fandom had the names of some of the uncredited cast (footmen, kitchen staff, etc.) but I couldn’t find anything about young Lady Eddison. Thanks!
I may have found an answer to this. The following possibly abandoned and certainly decaying web site names the performer as Hayley Selway.
https://guide.doctorwhonews.net/roles.php?code=Y&type=cast
And this site indicates the same person was uncredited as a nurse in Smith and Jones.
https://www.mentalis.co.uk/david-tennant/smith-and-jones
Since they don’t have an IMDb entry, one might conclude they are a background actor.
Thanks all!