To generate outcodes:

awk -F, -f split_outcodes.awk ukpostcodes.csv

To select 200k postcodes at random

shuf -n 200000 ukpostcodes.csv > target/pubs.csv

To create a list of random pub names

paste -d "," <(paste -d " " <(shuf -r animal_names.txt) <(yes "and") <(shuf -r animal_names.txt) | head -200000) target/pubs.csv > target/named_pubs.csv

Explanation:

• shuf -r animal_names.txt creates a list of randomly selected animal names.
• yes "and" just repeats "and" over and over
• the past -d " " ... concatenates all those, so we get a good combination of fake establishment names

$ paste -d " " <(shuf -r animal_names.txt) <(yes "and") <(shuf -r animal_names.txt) | head -10
Flameback and Asiatic leopard
Guillemot and Magpie
Zebra and White ibis
Wallaby and Rabbit
Polecat and Mole
Towhee and Petrel
Wader and Quetzal
Kākāriki and Condor
Piping shrike and Recurvebill
Badger and Zebra

• the outer paste, just merges the fake pub names with the previously selected 200k postcodes to derive a list of establishments.

Finding the minimum lat/lon:

$ gunzip -dc ukpostcodes.csv.gz | grep -v 99.9999990 | cut -f3 -d, | awk -F, 'BEGIN { max = -999; min = +999; } /[0-9.-]+/ { if ($1 > max) max = $1; if ($1 < min) min = $1; } END { print min, max; }'
49.181941000000000 60.800793046799900
$ gunzip -dc ukpostcodes.csv.gz | grep -v 99.9999990 | cut -f4 -d, | awk -F, 'BEGIN { max = -999; min = +999; } /[0-9.-]+/ { if ($1 > max) max = $1; if ($1 < min) min = $1; } END { print min, max; }'
-8.163139000000000 1.760443184261870

Village names pulled from http://download.geonames.org/export/dump/