I am visiting the UK and am proposed to stay for 6 months. Is praying the qasr salat permissible in my case, or do I have to perform the full prayer?
If you plan to travel to your destination and remain there for less than 15 days then you must pray the shorten versions of salah as you are considered a musafir (passenger based on Islamic explanation). As you are intending on remaining at your destination for 6 months then you must pray the full salah.
In the name of Allah, the most compassionate, the most merciful
According to the fatwa of Grand Ayatollah Khamanei, you ought to say your prayers completely (not Qasr) in case that your trip (intention) takes long at least ten days (or more). Then at the mentioned condition as you said “I am visiting the UK and am proposed to stay for 6 months. Is praying the qasr salat permissible in my case, or do I have to perform the full prayer?”. Of course there would be some different detailed matters or remarks concerning the mentioned matter, then you’d better refer to the source to see more complete response about it (if you are familiar with Farsi language).