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They just send out a blanket email knowing the kids are at home and need amusing. I hate that sort of business etiquette.
Check your "extras" in your MyO2
That means you are not eligible for it free then, sorry.
You can get 7 days free here https://disney.co.uk/ and after that you can get the £2 discount making it £3.99 a month.
Track usage, upgrade and get support with the My O2 appDownload My O2