Time was when the UK/Great Britain had the most powerful navy in the world. Policy dictated having a larger navy than any other pair of powerful nations. The UK sought to keep the peace, settle disputes and uphold its own imperial interests with this global mobile power.The first great German war stretched the UK military with victory only coming after the late arrival of the Americans. It was mainly a land war needing the French army. The second world war was a joint win for the UK, Russia and the USA. Post 1945 UK was badly damaged by the war. We had large debts to repay to the US who made us borrow and pay for war supplies. Government granted independence to many countries and accepted at Suez it could not dictate events against the wishes of the US. Since then we have accepted that the USA is the dominant power. It is her turn to police the peace, impose or assist settlements of disputes and pursue her global interests.
We have also accepted that we usually side with the US against the communist/authoritarian bloc. We are the second biggest contributor to NATO, which has provided collective defence in Europe against Soviet/Russian expansion.We did not join the US in their ill judged war in Viet Nam.
As I have previously shown, the UK has suffered badly from land wars and invasion threats from continental Europe. We have not had ambitions to conquer and occupy European lands for the last 500 years. Our sea moat has enabled us to see off the most aggressive imperial threats from Spain, France and Germany since 1500. As the US reconsiders its commitment to European defence the UK should not rush to replace the US in offering protection to continental countries. We should buttress the defences of these islands and look outwards to the rest of the world to expand our trade and friendships.
The UK defence priorities should be anti missile,drone and aircraft systems combining surveillance with effective response. We need a bigger navy to defend our coasts and shipping lanes. We need much more industrial capacity as you cannot defend yourself in war depending on imports.