How can i set the currency to pounds instead of USdollars for the website?

I am not using the ecommerce module for mysite, but have a currency field.

HousePage.php extract****
***************************
class HousePage extends Page {
static $db = array(
"numeric_price" => 'Currency'
);
}

my template page has $numeric_price.Whole

my php page is called HousePage.php

version: SilverStripe-v2.3.6

I think i've fixed it

Saphire >core>model>fieldtypes Currency.php

line 9: protected static $currencySymbol = '$';

changed to

line 9: protected static $currencySymbol = '£';

... and in config.php under mysite, you add:

Order::set_site_currency("Eur");