My DC attended a virtual insight session today for an engineering course he's applying to at Imperial, and someone asked this question. There were two international students on the call, and they looked a bit bemused - they said they didn't know anyone with a part-time job. The admissions tutor backed this up by saying they'd be expected to be available for lectures between 9-6 each day and will need lots of personal study time, so it's probably not the right option for people who "want to party every night or work part time". This may be true, but I thought the answer was delivered with very little empathy towards listeners who might not be able to afford to study in London without a part-time job.
If you have a DC at Imperial, do any of their friends work part time?