> Parliament means, in the mouth of a lawyer (though the word has often a different sense in conversation) The King, the House of Lords, and the House of Commons: these three bodies acting together may be aptly described as the "King in Parliament", and constitute Parliament. The principle of Parliamentary sovereignty means neither more nor less than this, namely that Parliament thus defined has, under the English constitution, the right to make or unmake any law whatever: and, further, that no person or body is recognised by the law of England as having a right to override or set aside the legislation of Parliament.
Note the use of the phrase "King in Parliament" - all law making authority derives from the historical powers of the Monarch, whereas the Lords and Commons guide and use that power. This can be seen in how UK Acts of Parliament begin "BE IT ENACTED by the Queen's most Excellent Majesty, by and with the advice and consent of the Lords Spiritual and Temporal, and Commons" - the Act is _enacted_ by the Queen, with the two Houses advising and consenting to the use of that ability.
Now it's possible that the role of the Monarch could be removed from the process, but it would arguably by one of the biggest fundamental _technical_ (not practical) changes to the British constitution in hundreds of years.