Add mailer to send requested CSV file

app/controllers/admin/statistics/nominations_controller.rb

@@ -9,6 +9,11 @@ def create
     authorize :statistics, :send?
 
     @search = NominationStatsSearch.new(FormAnswer.all).search(permitted_params)
+
+    data = generate_csv(@search.results)
+    file = current_admin.protected_files.create_from_raw_data(data, "nomination-statistics-export.csv")
+
+    Admin::Statistics::NominationMailer.notify(current_admin.id, file.id).deliver_now
 
     redirect_to admin_statistics_nominations_path(search: permitted_params), success: "CSV with nomination statistics has been sent to #{current_admin.email}."
   end

app/mailers/admin/statistics/nomination_mailer.rb

@@ -0,0 +1,12 @@
+class Admin::Statistics::NominationMailer < ApplicationMailer
+  layout "mailer"
+
+  def notify(identifier, file_identifier)
+    @admin = Admin.find(identifier)
+    @file = @admin.protected_files.find(file_identifier)
+
+    subject = "Nomination statistics export - King's Award for Voluntary Service"
+
+    view_mail ENV["GOV_UK_NOTIFY_API_TEMPLATE_ID"], to: @admin.email, subject: subject_with_env_prefix(subject)
+  end
+end

app/views/admin/statistics/nomination_mailer/notify.html.slim

@@ -0,0 +1,18 @@
+p.govuk-body
+  = "Dear #{@admin.first_name},"
+
+p.govuk-body
+  ' You requested an export of nomination statistics.
+
+p.govuk-body
+  ' Please find this report on the link below: 
+
+p.govuk-body
+  = link_to admin_protected_file_url(@file), admin_protected_file_url(@file)
+
+p.govuk-body
+  ' Kind Regards,
+
+  br
+
+  ' The King's Awards Office