A practical UK cloud gaming checklist
Check the game, device, subscription and connection together.

Xbox Cloud Gaming streams supported games on compatible devices. Begin with the current UK catalogue and find the specific game you want to play. A service offering cloud streaming does not establish that every game you are interested in is included, so make the title check your first step.
Next, confirm that your intended device is compatible and read the current subscription requirements. Check the connectivity requirements against the connection you expect to use, too. These checks belong together: finding a game in the catalogue is only useful if your device, subscription and connection also meet the requirements. Revisit the current details when you are ready to play, rather than relying on an old shortlist or assuming that information for another region applies in the UK.