giffgaff goodybags are for the UK only.
The heading on the goodybag page:
"Price per month, UK data, UK minutes, UK texts.
However, calls and texts to international and premium numbers are not included.
And members will need top up to make those calls and texts."
But, if you happen to have an active goodybag,
you'll get slightly cheaper rates in the EU with your Airtime Credit.