.. the camera that is. It’s back in the shop for the third time, this time with explicitly precise instructions on how to replicate the issue. Apparently they were trying to replicate it by pressing the menu button, not the shutter release. The manager at Jessops (where I got the camera) said if they still can’t find the problem, they’d probably look at supplying a replacement camera. Wonder if I can do a replacement and upgrade for £50? :)