Thanks MitchM.
For the first time I have some physical symptons other than lazyness and death.
I have attached a picture of one of my goldfish.
Ignore the bits of grass on the pond surface, I had just cut the lawn and was scooping out the bits of grass when I noticed the wound.
There is what looks like a bullet wound in the dead centre of his body, in the middle of his red coulered patch. Around the circumference the scales or mucus is actuall flapping around and he has the same in a slightly different place on the other side.
He is behaving relatively normal.
However, one of my red gold fish has a similar but smaller effected area and every now and then he goes on a full thrash around the pond so is obviously uncomfortable.
Another red gold fish is lethargic and another white one is also a little lazy, neither of those two appear to have any scale issues.
The fish in general seem high in the water but that may be because it is a warm day today.
As you know, this is my first ever pond so I am a relative novice so I really appreciate you help guys.