PL
This paper examines the influence of the incorporation of the Lisbon Treaty to the UK law and subsequent British legal regulations on one of the fundamental principles of the UK constitutional system – the doctrine of Parliamentary Sovereignty. The essay is divided in three main sections. The first explores the doctrine of parliamentary sovereignty and defines its meaning. The second one focuses on the accession of the UK to the European Communities in 1973 and its impact on the discussed principle. The last one treats on the British regulations incorporating the Lisbon Treaty to the UK law as well as recently enacted European Union Act 2011.