You are a Star! This has been very confusing and sometimes it's so easy to completely miss the glaringly obvious.
I'm now able to set my shutter speed anywhere between 2048 secs & 1/100k secs and I can stop my aperture down to f16.
Thank you ever so much, I'm now going to investigate some of the other features so you can probably expect many more very dumb questions very soon!
Thanks also hnikesch
Thanks again, Glyn.