GGP meaning in Regional ?

The pound is the currency of Guernsey. Since 1921, Guernsey has been in currency union with the United Kingdom and the Guernsey pound is not a separate currency but is a local issue of banknotes and coins denominated in pound sterling, in a similar way to the banknotes issued in Scotland, England and Northern Ireland (see Banknotes of the pound sterling). It can be exchanged at par with other sterling coinage and notes (see also sterling zone).

For this reason, ISO 4217 does not include a separate currency code for the Guernsey pound, but where a distinct code is desired GGP is generally used.