Idle is fine. I adjusted it off tb to 900rpm and is much happier. Is it normal for revs to rise slightly when pressing brake pedal firmly on a stationary idle? Sure I had put that question in which is what I really wanted to know.... Strange. Just wondering if it could be a brake vac leak.

It lost 500ml of coolant but no hg symptoms and hasn't dropped anymore that I've noticed. Is it possible for coolant to get into where the plugs are? Just as it splutters for a few seconds initially then not again til next morning and there is water or some fluid visible in exhaust tail pipe.