Ok this post @AnxiousApocalypse is packed with assumptions here and , as someone "of colour" (!) that is British born but who is concerned about rising immigration, let me try and help:
There is so much anti-immigrant sentiment in the UK and the West in general.
There has been a lot more migration from certain countries, many of them not necessarily officially in conflict or in war, but which seek the UK as an attractive destination due to language and existing family members.
So this has led to concerns.
There are a lot of people that believe if you are a person of colour that has grown up in the UK but have immigrant parents, then you are not British enough- even if you have spent your whole life here and integrated into British society.
Am in my 40s, female, grew up in the worse times than this, and I would challenge the "there are a lot of". I think there are a lot more outlets now such a social media that give coverage to these voices, but in my professional and personal life, no one is questioning me!
At my workplace, people talk about immigrants coming over on scam care worker visas schemes, bringing their dependants and taking up resources such as school places and NHS appointments when those are already lacking for those born in Britain.
But I don't think scam visas are ok?
Will most people not be happy until the UK has no non-white people at all?
This is seriously extreme, sorry OP, and deliberately provocative. NO, I don't think this is the case at all. You'll find "non white" people like me are also concerned about mass arrivals of young men, from particular communities and countries, time and time again arriving without families or any context, and slipping away into society without any identification, any screening, any support for integration. Where I live, this concerns people. Not their colour, but the culture issues.