Black smoke

[Matt]

Rallye runs absolutely fine, little tiny bit hesitant this morning and revs hang slightly but shortly after it cut out (icv related)

But went out in a local cruise tonight and whilst giving it some I'm told it puffs black smoke after gear change. I was taking it pretty much too the redline. I don't do this often so could it just be build up of soot/crap is the exhaust/engine been burnt up? 

I'm hoping it doesn't mean the engine is terminal