Ok, didn't update for a few days even though I tested because nothing changed and I was feeling pretty fed up with it. As I said in my amended post at the top I added a little more ammonia (up to 4ppm) the other day just to see if that would kick start it. Was suggested by someone and I couldn't see it doing any harm as it is definitely not as high as 8ppm.
Right, tank is an Elite 60. The filter is Fluval 2 plus. I put in the foam and polyester filter pads but
not the carbon as many people on here said carbon is not good. Last Sunday (20/09/09) I added some mature media kindly supplied by Justkia. By that time cycle had already stalled and unfortunately the media doesn't seem to have solved the problem (thanks for the media though Kia, it's still in there and I'm hoping the bacteria are just asleep!)
I am using Aqua One water conditioner - states on the bottle that it removes chlorine, chloramine and heavy metals found in tap water. I did originally use the tiny bottle of conditioner that came with the set up which was a nutrafin one. And early on I put in the tiny bottle of nutrafin cycle because the impression I got on here was that although it probably wouldn't do much good, it wouldn't do any harm.
In the tank is gravel from the LFS designed for aquariums, a couple of ornaments (specifically designed for fish tanks so I can't see that they are causing any problems) some plastic plants again from LFS, heater, filter and a glass thermometer. And my daughters invisible, imaginary fish

got to smile about something!
I have kept the tank at around 29 - 30 degrees most of the last 29 days (it did go up to 31 for a couple of days) and the pH has been 7.8 - 8ish al the way through.
I am actually seriously considering giving up and dismantling the tank. I cannot see where I am going wrong at all and it seems like nobody else can either.
If anyone can make any suggestions I would be very appreciative as my kids will be very upset if I give up but at the moment this is just becoming a stress.