If your nipples are approx 21cm and 20cm from notch, how much higher will they be raised with a lift? (Photo)

Based upon the information you provided and your pictures, you do not need a lift and would be better served with an augmentation only. Maybe myself and other surgeons answering your question are missing something that we cannot appreciate and would gain from a physical exam, but based upon information and photos you provided, a BA alone would give you an excellent result, you don't need a lift at this point(or the scars)

If you are at 20-21 cm, you wouldn't benefit much from a lift.  There is a risk of going to high with the nipples and this then cannot be corrected easily.  You may be better off with just an augmentation.  Best wishes, Dr. T. 

Measurements are just one factor taken into consideration for breast surgery.  An in person examination and discussion of your gaols is also very important.  From your photographs and with the measurement you claim you do not appear to need a lift but would likely achieve a good result with breast augmentation alone.  You mentioned Vectra - this is a fancy digital imaging tool but can be misleading as operative results will not usually not match those demonstrated by a computer generated image.

each person is unique and has a specific goal as well as specific measurements. The measured distances are good reference points but are just used as a guide. The main factor and goal is achieving a desired look that will make you happy long term. 

Each individual patient is different in terms of where on their chest the nipple should sit.  It is hard to say without an exam.  It doesn't look like you need much movement up for the nipples