Pick UCL so you can switch course incase you dislike chem eng, I regret not doing this - as I would have liked to changed course to comp sci.
I work in investment banking and studied chem eng, I hated the degree and thought the degree was outdated (compared to EEE/comp sci/mechatronics/statistics) and the lecturers (>50% foreign) out of touch/knowledgeable about even the chemicals/ oil & gas industries (I have worked in the chemicals sector)
study something useful which you enjoy at a prestigious university.