No. The UK should be renounced for the following reasons:
1) Lack of viability.
It does not officially define itself in racial or survival-related cultural terms and has no history of ever doing so. Its current condition is inherently unviable and unable to be reformed, culturally, politically or constitutionally (which is largely why it is in the diabolical state it is in). There is no safeguarding system in place protecting it from subversive efforts made by vile, genocidal, agenda-driven, barbaric culture-enabling and duplicitous politicians.
Preservation measures are impossible to realise under the current state of affairs. Political solutions are not viable anymore. The nefarious elites are cunning and have heavily manipulated the social and demographic conditions through meticulous engineering to render themselves untouchable politically.
2) Inappropriate identity.
It has always been a nation oriented around sentimental pettiness related to frivolous traditions, ceremonial nonsense and foreign racial intermingling. They are intrinsic features. To change the aforementioned qualities would be to change its very fabric. This nation has absolutely no history of racial preservationist activity or demographic safeguarding.
Foreign racial intermingling assists Islamification, the spread of other unsavoury cultures and globalist subversion.
3) The inferiority of national tribalism.
Nationality-binding tribalism is generally far weaker than racial or political tribalism. Under very desperate and life-threatening conditions (e.g an apocalyptic event, extreme necessity shortage), a considerable amount of your fellow countrymen will have no qualms about turning on you to survive. Groups with a uniting tribal characteristic have much less chance of fracturing than those without. Racial separatists would already have organised themselves into a community with territory, if extreme circumstances arose.
4) Its identity and the identity of its institutions place a strong emphasis on religion.
God is not real. If he were, he would have presented himself to the world by now. Religion is all fake superstitious nonsense invented by very primitive people to control other people for their own ends. Religion has been a very stagnating and unnecessarily divisive force throughout history and continues to be one today. There exists not a single creationist argument that has not been debunked.
Religion has been a motivating factor for a grossly massive number of pointless atrocities, societal conflicts and wars that have claimed the lives of many people throughout the centuries, designated and not.
Christianity also promotes notions like universal togetherness (leads to racial and ethnic heterogeneity) and unreasonable expectations of forgiveness, so it is detrimental from a survivalist perspective. A potentially dangerous element.