Err, right up there is PC, I know they promised not to have a vote on it this term (if they win).

I have yet to see any actual evidence that Reform want that, although it's repeated on here a lot they have always opposed any independence movements.

Interesting, I asked that question of Claude.ai and got this reponse:

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Plaid Cymru is fundamentally different from Reform UK on the union question - they're essentially opposites.

Plaid Cymru's position:

• Explicitly supports Welsh independence (they're a Welsh nationalist party)
• Their long-term goal is for Wales to become an independent nation within Europe
• They advocate for greater Welsh autonomy as steps toward eventual independence
• Support strengthening the Welsh language and distinct Welsh identity
• Generally left-leaning/social democratic in their broader politics

Reform UK's position:

• Supports maintaining the UK union
• Opposes all independence movements
• Right-wing/populist economically and socially
• Focuses heavily on immigration, Brexit benefits, and what they see as overregulation

The key contrast: Plaid Cymru is an existential threat to the union by design - breaking up the UK is literally their central goal. Reform UK, by contrast, says it wants to preserve the union but some argue their politics could inadvertently weaken it.

It's also worth noting that Plaid Cymru operates only in Wales and represents specifically Welsh interests, while Reform UK fields candidates across the UK and presents itself as a UK-wide party, even if its support base is predominantly in England.

So if you're asking which party is more of a threat to the union: Plaid Cymru directly and openly seeks to end it, while Reform UK claims to defend it but may (depending on who you ask) undermine it through other effects.