The British Constitution is uncodified meaning that it is not found in a single document - it is formed of hundreds of laws passed, unwritten conventions, and works of authority
The British constitution is unitary, meaning power is centralised due to the principle of parliamentary sovereignty and the Westminster government can do all that which is not impossible - Parliamentary Sovereignty applies to the Parliament of the day, meaning that Parliament cannot bind its successors - Brexit
The British Constitution operates under rule of law, subjecting everyone to the law - Magna Carta ensured the monarch was also subject to the law