Question re MHA

A psychiatrist from nhs reffered me for an MHA assessment, I did not know this until the community mental health team told me today. Can I decline an assessment ? Or can I ask for the home care team to drop it? I did agree to go with the home care team instead but will they still do the assessment ?I really don’t feel that it is the best thing for me, when I could go home and be with my parents and go privately. I have huge issue with other people coming and going from my house and all this is adding to fear and making it worse for my recovery.