ferg,
Don't be misled by caaflyer. Delta Connection does not 'operate its JAA courses through a partnership with Atlantic Flight Training in Coventry', it acts only as a sub-contractor. There is a significant difference in that the CAA has not given any sort of approval to Delta Connection in its own right and it can only operate (for JAA purposes) under the direction and supervision of the Head of Training of Atlantic Flight Training at Coventry. This is why you see no reference to Delta Connection (or Comair) on the CAA website.
Were you to choose to go to Sanford, you would not be enrolled as a student of Delta Connection but as a student of Atlantic Flight Training. You may not think that the distinction is important, since you would still gain a JAA licence, but, as a paying customer, you should at least be aware of it. There is no implied suggestion that Delta Connection is anything other than a perfectly splendid school, merely that they appear to misunderstand their position in the great JAA scheme of things.