Unfortunately, the latest version does require that the bolt is turned down when pulled back. I was told this was to satisfy an American market requirement. It's not a huge problem really and remains pretty easy to operate. It's just that, at this price, I think I have a right to expect 'slick and perfect'!
So far only shot Bisley pellets (as recommended by the seller), but I will be testing a range of different brands for power consistency and accuracy in near future so will post findings then.