are the prices there permanent or will the 60-70% off be removed?
From my experience (I order from Amazon UK on average twice a month for the past few years), although the prices revert back to just 20-30% off after a few weeks, DO NOT IMMEDIATELY PURCHASE THEM AT THAT HIGHER PRICE. The prices usually return to 60-70% off sale prices again a few weeks later.
When they have a CLEARANCE SALE, however, purchase DVDs IMMEDIATELY. Do not hesitate when you see prices over 80% off. Those are usually limited stocks, and sometimes, within 24 hours, the overstock has been sold and the price is back to 60% or even just 30% off. I got almost a dozen good DVDs for 2-3 pounds each one time, and saw their prices go back to 12-14 pounds just a few days later.
As explained in the PAL/NTSC threads referred to above, the shorter run times are due to the fps rate. They aren't due to cuts. It's just that the PAL versions of movies plays slightly faster than their NTSC counterparts. You may think that's bad, but I hardly ever even notice it.
I will state, however, that
older Amazon UK DVDs
did have cuts that removed some violent content from action/horror films. More recent releases, however, no longer have this problem.