Well, here is an unfortunate update. Got my camera back and they have fixed the eye sensor problem...and introduced an intermittent power problem. Sometimes the camera comes on with a faint blue screen on the LCD then won't turn off!!! I'm taking it back on Monday and they'd better replace it as I don't trust this one anymore. If they won't replace it I shall be onto Fuji in a big way as their product is not worthy of the price I paid. Actually, I'm a bit pig-sick of it now, it's just over six months old and for a £1000+ camera I am unimpressed to say the least. Two faults in half a year is more faults than I have had, in total, on any camera of any make since 1972. Whatever happens I think I'll get rid of it and buy another Nikon, really the Fuji is an over-complicated piece of crap.
I've just been thinking and strangely, the only other camera I've ever had a problem with, is another Fuji, an X20. That one went for several years before failing to work on aperture priority for some reason. I gave it to my son who mostly uses program mode.