diff --git a/.gitignore b/.gitignore
index 3697f25..7886a44 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,6 +13,9 @@ message-logs
 main
 timetable-mgr
 
+# Debug data
+cif_debug_data
+
 # Test binary, built with `go test -c`
 *.test
 
diff --git a/cif/helpers.go b/cif/helpers.go
index b3e1e9a..9b86afa 100644
--- a/cif/helpers.go
+++ b/cif/helpers.go
@@ -1,9 +1,13 @@
 package cif
 
 import (
+	"encoding/json"
 	"errors"
+	"os"
 	"time"
 
+	"git.fjla.uk/owlboard/go-types/pkg/upstreamApi"
+	"git.fjla.uk/owlboard/timetable-mgr/helpers"
 	"git.fjla.uk/owlboard/timetable-mgr/log"
 	"go.uber.org/zap"
 )
@@ -103,3 +107,31 @@ func parseDaysRun(daysBinary *string) []string {
 	}
 	return result
 }
+
+func debugWriteFile(header *upstreamApi.JsonTimetableV1, schedule *[]upstreamApi.JsonScheduleV1) {
+	if helpers.Runtime == "debug" {
+		log.Msg.Debug("Writing CIF Header and Schedule elements to file")
+		filepath := "./cif_debug_data/"
+		filename := time.Now().In(londonTimezone).Format("2006-01-02_15:04:05_CIF")
+
+		data, err := json.MarshalIndent(map[string]interface{}{
+			"header":   header,
+			"schedule": schedule,
+		}, "", "  ")
+		if err != nil {
+			log.Msg.Error("Error marshalling data", zap.Error(err))
+			return
+		}
+
+		err = os.MkdirAll(filepath, 0777)
+		if err != nil {
+			log.Msg.Error("Error creating directory", zap.Error(err))
+			return
+		}
+
+		writeErr := os.WriteFile(filepath+filename, data, 0777)
+		if writeErr != nil {
+			log.Msg.Error("Error writing debug file to disk", zap.Error(writeErr))
+		}
+	}
+}
diff --git a/cif/update.go b/cif/update.go
index fa6c324..acf212f 100644
--- a/cif/update.go
+++ b/cif/update.go
@@ -35,6 +35,11 @@ func runCifFullDownload(cfg *helpers.Configuration) error {
 	// Drop timetable collection
 	dbAccess.DropCollection(dbAccess.TimetableCollection) // I should edit this to prevent removal of VSTP entries in the database.
 
+	// If debug mode is on, call debugWriteFile
+	if helpers.Runtime == "debug" {
+		debugWriteFile(&parsed.header, &parsed.sched)
+	}
+
 	// Process CIF file
 	err = processParsedCif(parsed)
 	if err != nil {
@@ -71,6 +76,11 @@ func runCifUpdateDownload(cfg *helpers.Configuration, metadata *dbAccess.CifMeta
 			return err
 		}
 
+		// If debug mode is on, call debugWriteFile
+		if helpers.Runtime == "debug" {
+			debugWriteFile(&parsed.header, &parsed.sched)
+		}
+
 		// Check CIF Sequence
 		// Skip if LastSequence is >= to this sequence
 		if metadata.LastSequence >= parsed.header.Metadata.Sequence {