Statistics say it is not, due to the high volumes of African males who physically abuse their European female partners. Heterogeneity-enabled attacks.
Why would a Briton inflict African composition on their offspring? Look how very aesthetically inferior it makes people (tantamount to very heavy disfigurement). Horrendous! Partially non-European people also have massively lower survival rate for certain diseases (for example, many partially non-European people have tremendous difficulty finding compatible bone marrow donors to counter leukaemia, due to the vast genetic differences). Knowingly inflicting non-British composition, that is European, on your offspring, while knowing of its threatening effects, is horrid enough. I have paid the price for this, which is why this subject is something of raw nerve for me. I am working to have the damage fixed.
If this answer offends you, you are a brainwashing victim and/or are emotionally immature.
Highly incisive, very aware and very intensely strong-minded and pragmatic logician and tactician, very high-grade threat detector, nurturer of life-saving mental enhancement and developer of superior methods of societal organisation. Vehement advocate of human advancement, invulnerability and continuity / realisation of desirable and/or protective human, societal and global attributes (will viciously oppose any person or entity threatening these, without exception).