diff --git a/scripts/fetch_epc_prediction_corpus.py b/scripts/fetch_epc_prediction_corpus.py
index 2e69ee6c..24f31646 100644
--- a/scripts/fetch_epc_prediction_corpus.py
+++ b/scripts/fetch_epc_prediction_corpus.py
@@ -62,7 +62,7 @@ CACHE.mkdir(parents=True, exist_ok=True)
 WINDOW = {"date_start": "2026-01-01", "date_end": "2026-05-31"}
 TOTAL_PAGES = 7402
 SEED_PAGES = 20        # random search pages → postcode seeds
-N_POSTCODES = 150      # distinct postcodes to pull full cohorts for
+N_POSTCODES = 40       # distinct postcodes to pull full cohorts for
 random.seed(2026)      # reproducible draw