As an outsider (Singaporean national), I can only say congratulations. Singapore split away from a union several decades ago and went on its own. Here’s a piece from Wikipedia summing up that break away:
Singapore became part of Malaysia on 16 September 1963 following a merger with Malaya, North Borneo, and Sarawak. The merger was thought to benefit the economy by creating a common, free market, and to improve Singapore's internal security. However, it was an uneasy union. Disputes between the state government of Singapore and the federal government occurred on different issues, especially the federal policies of affirmative action, which granted special privileges to Malays guaranteed under Article 153 of the Constitution of Malaysia. Singapore's chief minister, Lee Kuan Yew, and other political leaders began advocating for equal treatment of all races in Malaysia, with a rallying cry of "Malaysian Malaysia!"[4]
Racial tensions between Chinese and Malays increased dramatically resulting in numerous racial riots. The most notorious riots were the 1964 race riots that first took place on the Prophet Muhammad's birthday on 21 July with twenty-three people killed and hundreds injured. The price of food increased greatly when the transport system was disrupted during the unrest, causing further hardship for the people....
The state and federal governments also had conflicts on the economic front. UMNO leaders feared that the economic dominance of Singapore would inevitably shift political power away from Kuala Lumpur. Despite an earlier agreement to establish a common market, Singapore continued to face restrictions when trading with the rest of Malaysia. In retaliation, Singapore refused to provide Sabah and Sarawak the full extent of the loans previously agreed to for economic development of the two eastern states. The situation escalated to such intensity that talks soon broke down and abusive speeches and writings became rife on both sides. UMNO extremists called for the arrest of Lee Kuan Yew.
Seeing no alternative to avoid further bloodshed, the Malaysian Prime Minister Tunku Abdul Rahman decided to expel Singapore from the federation. The Parliament of Malaysia voted 126–0, with all Singaporean MPs boycotting the vote, in favour of the expulsion on 9 August 1965. On that day, a tearful Lee Kuan Yew announced on a televised press conference that Singapore was a sovereign, independent nation. The new state became the Republic of Singapore.
Now, the impoverished island nation has become a world leader in so many ways. From a start with zero natural resources, the nation is now looked upon as a model country for many. This shows that if Singapore can do it, then so can the UK, which has a head start in so many ways. I am pleased that my adopted country has showed the world that where there is a will, there is a way. I hope the UK can now emulate Singapore.
Good luck to one island nation from another and from one friend to another.