diff --git a/app/models/scheme.rb b/app/models/scheme.rb
index 254953c19..9d760998d 100644
--- a/app/models/scheme.rb
+++ b/app/models/scheme.rb
@@ -6,7 +6,7 @@ class Scheme < ApplicationRecord
 
   has_paper_trail
 
-  scope :filter_by_id, ->(id) { where(id: (id.start_with?("S") ? id[1..] : id)) }
+  scope :filter_by_id, ->(id) { where(id: (id.start_with?("S", "s") ? id[1..] : id)) }
   scope :search_by_service_name, ->(name) { where("service_name ILIKE ?", "%#{name}%") }
   scope :search_by_postcode, ->(postcode) { where("schemes.id IN (SELECT DISTINCT scheme_id FROM locations WHERE REPLACE(locations.postcode, ' ', '') ILIKE ?)", "%#{postcode.delete(' ')}%") }
   scope :search_by_location_name, ->(name) { where("schemes.id IN (SELECT DISTINCT scheme_id FROM locations WHERE locations.name ILIKE ?)", "%#{name}%") }
diff --git a/spec/models/scheme_spec.rb b/spec/models/scheme_spec.rb
index 70eccc5c2..cb9d74578 100644
--- a/spec/models/scheme_spec.rb
+++ b/spec/models/scheme_spec.rb
@@ -77,6 +77,8 @@ RSpec.describe Scheme, type: :model do
 
         it "returns case insensitive matching records" do
           expect(described_class.search_by(scheme_1.id.to_s).count).to eq(1)
+          expect(described_class.search_by("S#{scheme_1.id}").count).to eq(1)
+          expect(described_class.search_by("s#{scheme_1.id}").count).to eq(1)
           expect(described_class.search_by(scheme_1.id.to_s).first.id).to eq(scheme_1.id)
           expect(described_class.search_by(scheme_2.service_name.upcase).count).to eq(1)
           expect(described_class.search_by(scheme_2.service_name.downcase).count).to eq(1)