If plan has single organisation, set timetable org to that org. However

form allows user over ride.

If joint plan then don't default plan select option, up to user to
choose.

application/blueprints/timetable/views.py

@@ -4,7 +4,12 @@
 
 from application.blueprints.timetable.forms import EventForm
 from application.extensions import db
-from application.models import LocalPlan, LocalPlanEventType, LocalPlanTimetable
+from application.models import (
+    LocalPlan,
+    LocalPlanEventType,
+    LocalPlanTimetable,
+    Organisation,
+)
 from application.utils import login_required
 
 timetable = Blueprint(
@@ -31,6 +36,14 @@ def add(local_plan_reference):
     action_text = "Add"
 
     form = EventForm()
+    if plan.organisations:
+        form.organisation.choices = [
+            (organisation.organisation, organisation.name)
+            for organisation in Organisation.query.order_by(Organisation.name).all()
+        ]
+    if plan.organisations and not form.is_submitted():
+        if len(plan.organisations) == 1:
+            form.organisation.data = plan.organisations[0].organisation
 
     breadcrumbs = {
         "items": [
@@ -71,6 +84,8 @@ def add(local_plan_reference):
             notes=form.notes.data,
         )
         plan.timetable.append(local_plan_timetable)
+        if form.organisation.data:
+            local_plan_timetable.organisation = form.organisation.data
         db.session.add(plan)
         db.session.add(local_plan_timetable)
         db.session.commit()