Hearts of Iron 4 is a complex and challenging game, and the optimal opening strategy for the United Kingdom will depend on a variety of factors such as the game difficulty, your personal playstyle, and the game version. However, here is a general opening strategy that can help you get started:

1. Focus on naval production: As the UK, your strength lies in your navy, so you should prioritize naval production at the beginning of the game. Build destroyers, cruisers, and submarines to protect your shores and prepare for the inevitable naval conflict with Germany.

2. Expand your industry: Use your significant resources and factories to develop your industry. This will allow you to produce more military equipment, expand your navy, and support your allies.

3. Form alliances: The UK is a global power and can make use of alliances to help balance the power dynamic on the continent. Focus on creating an alliance with the United States, who can provide critical military and economic aid to support you during the war.

4. Plan for war: Germany will likely attack you at some point, so you need to be prepared. Plan your defenses and prepare your navy to repel the German invasion. Focus on creating a strong air force to provide air support to your navy.

5. Research naval technologies: Invest in naval technologies to stay ahead of Germany's naval power. Focus on researching technologies that improve your naval capabilities, such as advanced radar, naval doctrines, and aircraft carriers.

Remember, this is just a general strategy and there are many different paths you can take in Hearts of Iron 4. Be adaptable and respond to the changing conditions of the game to achieve victory.
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