Confusion over IR or CB ESA

I’ve received my managed migration letter but I’m really worried because I thought I was on IR-ESA only but now I’m not sure what is going to happen. I get a £10 Christmas bonus with my ESA in December which I’ve read means I’m on CB-ESA but the letter also says ‘Your total income-related amount’ is the full amount I get, which makes me think it’s all income-related.

I was on incapacity benefit years ago and remember my social worker at the time getting me to fill out a ‘incapacity in youth’ form. I get a letter each year from HMRC which says ‘Taxable benefit = £0’

Could anyone help me understand what type of ESA I’m on and what will happen when I start the UC claim?