For the indigenous British population, some of the immigrant population (the muslims), and the British government, there is a glaring difference. The British government have arms and the military, The muslims have likely smuggled arms into Britain and hidden them in mosques and elsewhere, but the indigenous British citizens have almost no useful armament. It would likely be a lopsided 3-way war until the muslims won.
Not to mention that Starmer would turn a blind eye and let the Muslims shoot everybody.
Sadiq Khan is already the Mayor of London, their capital and largest city in the UK. So they are halfway there already. Eventually, he'll become the PM.
Tommy Robinson will be exiled to USA (assuming Vance or Rubio will be the next POTUS).
The English have become such nancyboys that the muzzies don’t even need firearms. They will use blades.