diff --git a/etl/age_band_calculator.py b/etl/age_band_calculator.py
index 1c09476..61eb207 100644
--- a/etl/age_band_calculator.py
+++ b/etl/age_band_calculator.py
@@ -53,7 +53,22 @@ for installer in installers:
             df["week_commencing"] = date
             all_dfs.append(df)
 
-giant_df = pd.concat(all_dfs, ignore_index=True)
-giant_df
-giant_df.to_csv("age_band.csv")
+for df in all_dfs:
+    print(df)
 
+
+giant_df = pd.concat(all_dfs, ignore_index=True)
+giant_df.to_excel("age_band.xlsx", index=False)
+
+giant_df['week_commencing_cleaned'] = pd.to_datetime(
+    giant_df['week_commencing'].str.replace("W.C. ", ""),
+    dayfirst=True
+)
+pd.set_option('display.max_rows', None)
+
+grouped = giant_df.groupby(['week_commencing_cleaned', 'age_band']).size().unstack(fill_value=0)
+grouped = grouped.sort_index()
+print(grouped)
+
+output_file = "grouped_age_band_by_week.xlsx"
+grouped.to_excel(output_file)
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