VOR,
As I read his post I'm afraid he does have a problem, although he is getting his terminology mixed up.
Your correct in saying that the limits are -+5 for long/short sightedness, and the astigmatism limit is 2. However Halfbakedboys problem is that he is just outside the limit for anisometropia (this is the difference in the correction between the eyes). This cannot be more then 2.
Since one of his eyes is -2 and the other is +0.25 he is 0.25 outside the intial limit for this unfortunatly. This limit however is 3 for renewal so he should talk to the CAA and they can give him all the information.