If you need to process the file in spreadsheet software like Google Sheets , which has row limits, you may need to split the file into smaller 100k chunks.
Use the list as a "Golden Record" to validate UK addresses or names entered in a web form.
To develop a feature using a "150k UK.txt" file—likely a dataset of 150,000 UK-specific entries like postcodes, words, or user records—you can implement a high-performance system . Suggested Feature: UK Postcode or Word Search
