I sure hope you are not a professional IFR rated pilot...but I am quite sure you are a flightsimmer...
Cloud base has nothing, zero, nada, zip to do with minima for a cat1 approach.
As long as you have the required RVR values and see the required amount of approach/runway lights at your DA, then you can legally land.
I have performed countless cat1 landings where stated cloudbase is OVC001. Most of the time, approach and runway lights on max. Intensity shine right through the soup, especially if the cloudlayer is this low ( meaning stratiform clouds).