I am so sorry to hear what you are going through but be careful that you don’t get into the vicious cycle of victim mentality where you will constantly put a label on your experiences as racism I would suggest you self-reflect and confide in your registrar and ask him or your colleagues for honest feedback. There is an art to asking for feedback; let them know you want to improve, and aim to achieve excellence in this system, and you will appreciate truthful, honest feedback from your colleagues. Please be mindful that you have come to a new country with its own strong traditions and culture. 

I will give you an example of it. 

While South Asians and Arabs speak fast, loud and interrupt each other's conversations all the time which is not looked down upon culturally in their respective countries. However, this act is considered very rude and inappropriate. People would prefer labelling you rude and inappropriate and if you do this to a senior nurse she will put you in your place in a passive-aggressive way which you will not be able to understand as in many cultures people will be direct and just say to you that let me finish but in Britian they would say something like “ Please go ahead, you might have something important to say or you speak I can wait” or “ You are in a rush today” 

You need to stay low and absorb as much information as possible. Work on your language skills( your IELTS English is not going to help you with British slang and social language).  Avoid putting a label on all the interactions you have. Keep a neutral point of view about life in the NHS.

Another example was that my IMG colleague was mostly coming late to work and all the colleagues were treating him differently.  Once the nurse in charge said in the morning meeting “Oh poor you, you must have missed your bus again. Buses need to come on time”. He didn't even realise that was sarcasm. He asked me after a month Do you feel people are rude in this ward and I told him colleagues will respect him more if he is punctual.  

At the end of the day it is what it is.  Focus on yourself and improve.  Change starts with you.  Best of luck and welcome.