Are my A-Level choices suitable for Chemical Engineering

I have taken Maths, Chemistry and D.T (Product Design). I am looking to go to top uni's in chemical engineering (Queens mary, UCL, Brunel). I am not looking to go to very very highly regarded unis such as cambridge and oxford. I just want to know if these a level choices are good to apply for these courses while achieveing theire desired results (AAA/AAB)

Chemistry is good but there’s way more physics and maths in chemical engineering than chemistry

I have taken Maths, Chemistry and D.T (Product Design). I am looking to go to top uni's in chemical engineering (Queens mary, UCL, Brunel). I am not looking to go to very very highly regarded unis such as cambridge and oxford. I just want to know if these a level choices are good to apply for these courses while achieveing theire desired results (AAA/AAB)

That is true, but A-level Chemistry is a common admissions requirement.
I would probably suggest physics and also considering A-level FM.
Product design isn't particularly related to chemical engineering (there may be an argument of the relevance of it for e.g. mechanical engineering or something, but I can't really see any obvious relation for chemical engineering) and places like Cambridge or Imperial will likely prefer to see FM and A-level Physics (and FM outside of those unis in general) would be better preparation for the course since as noted, it's largely maths and physics based.

Would it change the chances of me getting in?

Bit harder to say for physics, if the course doesn't formally require a second science along with maths and a first science then in principle no, although realistically you should probably also think of things beyond just admissions. You are in theory preparing yourself for that course and remember, getting onto the course is just step 1 - you then need to actually complete the 3-4 year degree and hopefully do well in it. Therefore it does make sense to choose the options that best prepare you for that degree.
For FM I would expect you'd be a bit less competitive for Oxbridge or Imperial without it. The same advice above applies in principle too though.

I have taken Maths, Chemistry and D.T (Product Design). I am looking to go to top uni's in chemical engineering (Queens mary, UCL, Brunel). I am not looking to go to very very highly regarded unis such as cambridge and oxford. I just want to know if these a level choices are good to apply for these courses while achieveing theire desired results (AAA/AAB)