Ben Lake is one of the more intellectually serious Plaid Cymru MPs, which admittedly is not the highest bar in modern Westminster but still counts for something. He won Ceredigion in 2017 and has held it through boundary changes since. Unlike many colleagues who treat Parliament as a personal branding opportunity, Lake actually makes policy arguments about rural communities, agriculture, Welsh language rights and constitutional reform. His interventions tend to be better researched than most of what surrounds him.

Wales has real grievances about Westminster. Chronic underinvestment, weak infrastructure, economic policy designed around London and the South East, constitutional arrangements that treat Welsh devolution as an afterthought. These problems are not invented. They explain why many Welsh voters stopped trusting the major British parties decades ago. Plaid Cymru exists partly because those complaints were never properly addressed.

The political tension sits between diagnosis and prescription. Lake is articulate about what Westminster gets wrong on Wales. He is considerably vaguer about what an independent Welsh state would actually look like. Currency, pensions, public spending, the fiscal transfer Wales currently receives, trade with England. The arithmetic is difficult and the answers become noticeably thinner the more specific the questions get. Most independence movements face this problem in their early decades. Plaid will eventually have to answer it convincingly, not just confidently.

There is the obvious observation about devolution era nationalism. Politicians build careers criticising Westminster while drawing Westminster salaries, claiming Westminster expenses, accumulating Westminster pensions. The honest framing is that this is an occupational tension rather than personal hypocrisy. Plaid MPs have to sit in Parliament to argue for Wales leaving it. Refusing the seat would simply remove Welsh nationalism from the chamber entirely. But the rhetoric of opposition has to be matched by credible alternative governance, and Lake is sometimes stronger on rhetoric than substance. The salary is not the scandal. The missing spreadsheet behind the slogans might be.

A fairer assessment is that Plaid under figures like Lake is doing actual intellectual work that other nationalist movements have sometimes neglected. Welsh devolution remains less developed than Scottish, the population base is smaller, the political infrastructure for independence less built out. Lake is one of the people trying to strengthen that intellectual foundation. Whether it succeeds depends on whether Plaid can produce the costed, detailed economic case for Welsh independence that harder questions demand, or whether Welsh nationalism remains primarily cultural and grievance focused rather than a credible governing alternative.

Lake avoids most of the personality theatrics dominating Westminster. He is calm, prepared, more interested in the work than himself. The question is whether his strand of Welsh nationalism can persuade voters who currently support it as protest rather than serious constitutional preference. That is the real test. Plaid has not yet had to take it. It is getting closer.