It's just simple project planning.
1. Get an idea
2. Will it be a vote winner
3. Speak to SME (subject matter experts) and see if it is feasible
4. What needs to be done to make it happen? Act of parliament, change of law, etc?
5. Do a full time and cost analysis
6. If it is still feasible, announce it to the public/stick in your manifesto.
The problem with populist parties like Reform and Conservative (from Boris onwards), is that they skip points 3, 4 and 5, because that requires hard work. And when it inevitably come round and bites them in the arse, they blame liberal lefties, woke, civil service, 'the blob', the WEF, EU, ECHR - in fact pretty much anyone except for themselves, when in reality it was their piss poor due diligence that is to blame.