BBC iPlayer is the most tightly geo-locked mainstream streaming service in the world. It refuses every address outside the United Kingdom, it asks for a UK postcode when you create the BBC account it requires, and inside the UK the law requires a TV licence to watch it. There is no international version; BritBox carries a selection of BBC programmes abroad, and the rest of the catalogue, the live channels and the sport are UK only.
The BBC also works harder than most to keep VPNs out. It blocks address ranges it associates with VPN providers and datacenters, and the message you get is the plain one: this content is only available in the UK. The address is what is blocked; a different London address usually works, and a residential-looking one works best.
GhostShield's London server exists for this. Connect, sign in with a BBC account registered to a UK postcode, and iPlayer plays: live BBC One and Two, the catch-up catalogue, the box sets and the sport that is not sold elsewhere.
Who uses it is mostly Britons abroad: expatriates, students and travellers who already pay a licence at home and want their own television.