I am a US Green card holder. Indian Passport. Need a 3 day visa to London urgently for an interview. What is the process

I’m us citizenship I want to visit my friends or relatives in London we need to get a visa or document to 🇬🇧 uk embassy!

Does anyone know where to get the right form for an indian visa for english passport holder. EVisa not valid for british passport right now. On hold since nov 21 due to COVID

https://uk.usembassy.gov/visas/immigrant-visa-faqs/the-affidavit-of-support-form-i-864/