All those who are different to you are not illegal immigrants. Probably most of them were born here, all of whom consider UK as home.Well done! You are aiding illegal immigration by paying them. Talk with your wallet and do not support such establishments.
The ordinary punter does give a bollux about illegal immigrants.
It adds pressure to the NHS, to school places, to taxpayers funding their benefits and it also reduces the ordinary punter's employment opportunities. I saw a Iraqi refugee the other with a 21 plate Merc saloon. Where did he get money for that? The taxpayer is funding it. Some organization or other has got of taxpayer's money to give him that vehicle. Meanwhile, you or me drive old bangers.
By the same token there might be some Caucasian illegal immigrants. But you'll be hard pressed to detect those, and no doubt you'll be friendly towards them.