I had to do a slight refactor to make the fix that Gavin and I agreed on:

=== modified file 'lib/lp/bugs/browser/bugtarget.py'
--- lib/lp/bugs/browser/bugtarget.py	2009-12-16 08:13:19 +0000
+++ lib/lp/bugs/browser/bugtarget.py	2009-12-16 09:38:58 +0000
@@ -270,6 +270,44 @@
         LaunchpadFormView.__init__(self, context, request)
         self.extra_data = FileBugData()
 
+    def initialize(self):
+        LaunchpadFormView.initialize(self)
+        if (not self.redirect_ubuntu_filebug and
+            self.extra_data_token is not None):
+            # self.extra_data has been initialized in publishTraverse().
+            if self.extra_data.initial_summary:
+                self.widgets['title'].setRenderedValue(
+                    self.extra_data.initial_summary)
+            if self.extra_data.initial_tags:
+                self.widgets['tags'].setRenderedValue(
+                    self.extra_data.initial_tags)
+            # XXX: Bjorn Tillenius 2006-01-15:
+            #      We should include more details of what will be added
+            #      to the bug report.
+            self.request.response.addNotification(
+                'Extra debug information will be added to the bug report'
+                ' automatically.')
+
+    @cachedproperty
+    def redirect_ubuntu_filebug(self):
+        if IDistribution.providedBy(self.context):
+            bug_supervisor = self.context.bug_supervisor
+        elif (IDistributionSourcePackage.providedBy(self.context) or
+              ISourcePackage.providedBy(self.context)):
+            bug_supervisor = self.context.distribution.bug_supervisor
+
+        # Work out whether the redirect should be overidden.
+        do_not_redirect = (
+            self.request.form.get('no-redirect') is not None or
+            [key for key in self.request.form.keys()
+            if 'field.actions' in key] != [] or
+            self.user.inTeam(bug_supervisor))
+
+        return (
+            config.malone.ubuntu_disable_filebug and
+            self.targetIsUbuntu() and
+            self.extra_data_token is None and
+            not do_not_redirect)
 
     @property
     def field_names(self):
@@ -928,45 +966,13 @@
     show_summary_in_results = True
 
     def initialize(self):
-        LaunchpadFormView.initialize(self)
-
-        if (config.malone.ubuntu_disable_filebug and
-            self.targetIsUbuntu() and
-            self.extra_data_token is None and
-            not self.no_ubuntu_redirect):
+        FilebugShowSimilarBugsView.initialize(self)
+        if self.redirect_ubuntu_filebug:
             # The user is trying to file a new Ubuntu bug via the web
             # interface and without using apport. Redirect to a page
             # explaining the preferred bug-filing procedure.
             self.request.response.redirect(
                 config.malone.ubuntu_bug_filing_url)
-        if self.extra_data_token is not None:
-            # self.extra_data has been initialized in publishTraverse().
-            if self.extra_data.initial_summary:
-                self.widgets['title'].setRenderedValue(
-                    self.extra_data.initial_summary)
-            if self.extra_data.initial_tags:
-                self.widgets['tags'].setRenderedValue(
-                    self.extra_data.initial_tags)
-            # XXX: Bjorn Tillenius 2006-01-15:
-            #      We should include more details of what will be added
-            #      to the bug report.
-            self.request.response.addNotification(
-                'Extra debug information will be added to the bug report'
-                ' automatically.')
-
-    @property
-    def no_ubuntu_redirect(self):
-        if IDistribution.providedBy(self.context):
-            bug_supervisor = self.context.bug_supervisor
-        elif (IDistributionSourcePackage.providedBy(self.context) or
-              ISourcePackage.providedBy(self.context)):
-            bug_supervisor = self.context.distribution.bug_supervisor
-
-        return (
-            self.request.form.get('no-redirect') is not None or
-            [key for key in self.request.form.keys()
-            if 'field.actions' in key] != [] or
-            self.user.inTeam(bug_supervisor))
 
     @safe_action
     @action("Continue", name="search", validator="validate_search")