Very nice photos.
If you go to the bottom of the V6 recording sheet there is a tab labelled GB checklist, Serpula himantioides is present on that.
Tom is the person to talk to – but you can unlock wth spreadsheet and add it to the species list in order to record it.
P.S. I have sent Tom an email. His answer is below..
“Yes…it us easy to add a missing species BUT if everyone did so we would have several versions of the recording sheetin circulation…and not everyone would be as cautious as you, Doug,in getting the addition right. So. The advice I have put out is primarily do not add. Just notify me and I will check, add and insert on to the record sheet from individuals when submitted. That keeps everything ship shape.