LMC6042 OpAmp Output Not Driving BC547 Transistor Collector Stays at 12V

Hello again.Could someone pls suggest why this won't work? I've chosen an LMC6042 for its low current draw, but as it will source about 10mA I need to add an output stage, a BC547 as in the diag below.
No prob, I stupidly thought. Unfortunately.... the collector stays at 12v, regardless of the zero to 4v at the base.Thanks again!

I meant to say, "...will ONLY source about 10mA..."

Graham I have been trying to contact you privately but no joy, has your email address changed?As above I am still assisting EPE readers as their queries are usually genuine and they're interactive (and grateful...)If you are seeing 0-4V on the BC547 base then something is wrong because a transistor base should only have a maximum of 0.6V on it relative to the emitter (which is at ground here. So:- Maybe the transistor is dead (or you used a PNP (BC557) in error) or- maybe you have a bad connection in the transistor ground line.Hope this helps / David

I think no..it is not only limited to 10 mA.You can check datasheet though 

Well yeah i guess only about 10 mA