Here's a possible opening strategy for the United Kingdom in Hearts of Iron 4:

1. Focus on building up your navy and air force to protect your island nation from potential invaders.
2. Join the Allies and start sending lend-lease aid to France and other European countries fighting against Germany.
3. Begin researching technologies that will improve your military capabilities, such as radar and jet engines.
4. Expand your colonial holdings in Africa and Asia to secure resources and increase your manpower pool.
5. Consider launching naval invasions of Italy or North Africa to open up new fronts against the Axis powers.
6. Keep a close eye on the political situation in Europe and be prepared to intervene if necessary to prevent Germany from dominating the continent.
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