Three has implemented a minimum top-up of €10, but I understand that it's still possible to top-up by €5 with third parties. I live in London, and I want to keep my Irish number active, but I can't just pop into a local shop in Ireland for a €5 top-up.
I don't want to top-up by €10 because of Three's very mean hard expiry policy of 6 months since the top-up. Given that €5 buys 2272MB of data roaming in the UK and EEA (at €0.0022/MB), I can more easily consume €5 every 6 months.
How can I top up €5 from outside Ireland?