Examine the comparative structural mechanics of the Indian and British Parliamentary systems:
1. Both democratic architectures are fundamentally anchored upon the absolute, unchecked doctrine of Parliamentary Sovereignty.
2. Both operational frameworks legally mandate that the acting Prime Minister must be exclusively selected from the lower legislative chamber.
3. The British architecture maintains a strict system of legal responsibility for ministers requiring official countersignatures, a mechanism India abandoned.
4. Both geopolitical systems operate under the umbrella of a Republic, utilizing an elected Head of State.