Help pick my last option

Hii, I’m in yr13 and I have to submit my ucas in like 2 days. I’m debating whether to switch my options or add on a last, at the moment my list is kings, Birmingham, Manchester and Nottingham. I am applying for neuroscience but they’re all different course titles. I am eligible for contextual offers from kings and Bristol. At king this brings my offer from AAA to AAC and at Bristol it would be either A*AA to AAB or AAA to ABB depending on which course I go for. I’m debating between putting one of the Bristol options instead of UCL which is my dream uni and is what I initially put. My school is going to predict me AAA but my teachers currently think i will get ABB, is it a risk to put UCL or should I got for it?

You don't have to submit all 5 at the same time.

So when would I put the last?

Whenever you like. But preferably before the equal consideration deadline!