Once again you have the applicable minima therefore there is no reason why you can not continue the approach to minima and if you have the required visual references complete the circling procedure.
The decend to 1000ft and decide there is a total red herring. If you set your decision height or minimum descent height to 1000ft then;
a) You need higher Visibility / RVR for an approach; and
b) JAR OPS says that if the minima are at or above 1000ft then the company must set a higher height at which the Ban becomes applicable....which is common sense really.
Thus with a new self imposed MDH of 1000ft the ban height would be 1500ft or 2000ft or whatever the company has set.
Overall, we must all remember that we are talking about a rule that deals with comencing and Continuation of an approach which are two separate issues.
Once can not commence an approach when the weather is below applicable minima. That simply means do not start, do not pass go, stay in the hold or however you wish to think of it.
If one has commenced the approach because when one did have the applicable weather at that time, if the weather subsequently deteriorates then there are two cases -
a) Outside the OM or equivalent position or height - Go Arround.
b) Inside the OM or equivalent position or height - continue to minima and decide there.
Thus if the above situation exists before you start the approach then if you believe that you can not complete the approach to applicable minima you will not be starting it a all and you will be diverting or using some holding fuel to hold awaiting an improvement.
Regards,
DFC