diff --git a/R/add_keep_population_flag.R b/R/add_keep_population_flag.R
index 7b89c9b48..440772acd 100644
--- a/R/add_keep_population_flag.R
+++ b/R/add_keep_population_flag.R
@@ -24,6 +24,7 @@ add_keep_population_flag <- function(individual_file, year) {
     year_available <- pop_estimates %>%
       dplyr::pull(year) %>%
       unique()
+
     if (calendar_year %in% year_available) {
       pop_estimates <- pop_estimates %>%
         dplyr::filter(year == calendar_year)
@@ -70,17 +71,18 @@ add_keep_population_flag <- function(individual_file, year) {
     # If they don't have a locality, they're no good as we won't have an estimate to match them against.
     # Same for age and gender.
     nsu_keep_lookup <- individual_file %>%
+      dplyr::filter(gender == 1 | gender == 2) %>%
       dplyr::filter(!is.na(locality), !is.na(age)) %>%
       # Remove people who died before the mid-point of the calender year.
       # This will make our numbers line up better with the methodology used for the mid-year population estimates.
-      # anyone who died 5 years before the file shouldn't be in it anyway...
-      dplyr::filter(death_date > mid_year | nsu != 0) %>%
+      dplyr::filter(death_date > mid_year | is.na(death_date) | nsu != 0) %>%
       # Calculate the populations of the whole SLF and of the NSU.
       dplyr::group_by(locality, age_group, gender) %>%
       dplyr::mutate(
         nsu_population = sum(nsu),
         total_source_population = dplyr::n()
       ) %>%
+      dplyr::filter(nsu == 1) %>%
       dplyr::left_join(pop_estimates,
         by = c("locality", "age_group", "gender")
       ) %>%
@@ -137,7 +139,7 @@ add_age_group <- function(data, age_var_name) {
   data <- data %>%
     dplyr::mutate(
       age_group = dplyr::case_when(
-        {{ age_var_name }} >= 0 & {{ age_var_name }} <= 4 ~ "0-4",
+        {{ age_var_name }} >= -1 & {{ age_var_name }} <= 4 ~ "0-4",
         {{ age_var_name }} >= 5 & {{ age_var_name }} <= 14 ~ "5-14",
         {{ age_var_name }} >= 15 & {{ age_var_name }} <= 24 ~ "15-24",
         {{ age_var_name }} >= 25 & {{ age_var_name }} <= 34 ~ "25-34",
diff --git a/run_slf_process_manually.R b/run_slf_process_manually.R
index 70dba2ba4..b5f4dbbb2 100644
--- a/run_slf_process_manually.R
+++ b/run_slf_process_manually.R
@@ -4,16 +4,16 @@ library(createslf)
 
 ---
 
-## UPDATE: Year you would like to run ##
-year <- "2223"
+  ## UPDATE: Year you would like to run ##
+  year <- "2223"
 
 ## UPDATE: Year on "processed_data_list_XXX" ##
 processed_data_list <- targets::tar_read("processed_data_list_2223")
 
 ---
 
-# Run episode file
-create_episode_file(processed_data_list, year = year) %>%
+  # Run episode file
+  create_episode_file(processed_data_list, year = year) %>%
   process_tests_episode_file(year = year)
 
 # Run individual file