Buying the card is only the first step; redeeming it requires specific conditions:
: You cannot redeem a US Dollar gift card on a UK Apple ID. You must create a separate US-region account. buy us itunes gift card in uk
: Apple gift cards are strictly restricted to the country of purchase. A US card will not work for UK-specific apps or subscriptions. Buying the card is only the first step;
: Provides larger denominations like a £75 card for approximately $90.99 USD . buy us itunes gift card in uk
Buy UK Apple Gift Cards Online - Email Delivery - MyGiftCardSupply
: Offers various denominations, with some cards listed around $52.99 USD for a £30 UK card (note: check for US specific listings on their site).