Quickstart: Format amounts as GBP for UK readers

Format in JavaScript

const gbp = new Intl.NumberFormat('en-GB', {
  style: 'currency', currency: 'GBP', maximumFractionDigits: 0,
});
gbp.format(product.max_amount);  // "\u00a3150,000"

Format in PHP and Python

$fmt = new NumberFormatter('en_GB', NumberFormatter::CURRENCY);
echo $fmt->formatCurrency($product['max_amount'], 'GBP'); // \u00a3150,000

import babel.numbers
babel.numbers.format_currency(product['max_amount'], 'GBP', locale='en_GB')

Amounts vs repayments

Product min_amount/max_amount are whole pounds, so display them with no decimal places. A quote repayment can carry pence, so format those with two decimal places. Mixing the two — showing a repayment as a round number — quietly misstates the cost, so pick the right precision per field.

Never build currency strings by hand

Prepending a \u00a3 and inserting commas with your own code breaks the moment an amount crosses a thousands boundary or you support another locale. The platform formatters above handle grouping, the currency symbol and rounding correctly, and they are the same across your whole app — so a figure looks identical wherever it appears. Keep one formatter instance and reuse it rather than constructing a new one per value.