You’ll be fine at Imperial or Oxbridge for a career in engineering & they both keep open the door to high finance (although should you wish to pursue IB or similar you’ll have to jump on the bandwagon the minute you get to uni).
Oxbridge & Imperial engineers often do summer internships after years 2 & 3 then move into a grad role, whereas other large unis do push more for the 12 month placement. I tend to recommend a placement year, although the lack of placement year doesn’t seem to hold Oxbridge students who do well in recruiting regardless, I think this is generally because they are just highly competent people and do well thinking & communicating analytically under pressure (which is what tends to separate the wheat from the chaff at interview).
i will note Oxbridge & Imperial grads disproportionately represented in particular sectors of engineering mainly energy related industries as well as technical/engineering consultancy. These jobs in general pay a fair bit more then your average industry job, but are more competitive to break into.