PostgreSQL: CAST() as money: specify currency

I'm looking to specify the currency as GBP when casting as money in PSQL. Currently, this prefixes the formatted value as USD (with $):

SELECT CAST(SUM(cost) AS MONEY) AS Total FROM orders;

Gives:

Total | $13,266,314.00

Is there a nice way way to specify £ when casting to money instead of $ or will this require CONCAT(), ROUND() and TO_CHAR()?

You may set lc_monetary in postgresql.conf, or within your sql client. Here is the latter test case:

set lc_monetary to "en_IE.utf8";
select 10::money;

 money  
--------
 €10.00
(1 row)

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