I'm pretty sure OP is either trolling or is very much seeing everything through rose tinted glasses.
OP complains that Engineering is soul destroying then offers IB as an alternative which while earning noticeably more involves working double the hours or more each week and is generally not considered to be a particularly skilled or fulfilling job.
I grew up in the finance world and all the earnings that come with it, even more actually as I come from a higher income area than the UK. But actually you don't make that much more than what OP is saying unless you're in the Big 4 or really climbing ladders. My friends are now on 6 years of experience in the industry, working at major companies albeit not Big 4 and they are making just over the £30k mark. It's also worth noting that the typical route to a finance career is not via a degree and so to an extent you have already made a mistake if you've gone the degree route akin to the side of engineering that most people will come here for.
I had a pretty good life offered to me working for a medium sized company in the finance/business sector, with salaries most people making this choice could only dream of, travel opportunities with first class tickets across the world, access to the company's helicopter, being on the board before I turned 25 let alone 40 which would already be an incredible feat for most. That's what the right engineering expertise and the right job seeking expertise at the right place and time will get you in that industry, you can turn their millions into much more and they will return the favour in kind. That life wasn't my cup of tea however, of course it will be for some people but you really need to be in the situation before you know. It's also far from the norm, you get that when you run circles around the current people running things, not being a bog standard graduate.
It's also worth noting that engineering jobs tend to be in areas with lower cost of living so while you may be earning less you will have a lot more disposable income. For context I'm currently on my PhD stipend of £15k (~£17k taxable income equivalent) plus a little extra from other work in a major city, I have my own apartment, I eat out at good restaurants, and I'm on track to have about £5k leftover this year (or I would have if I wasn't travelling a lot). The main difference is I don't drive which would add about £3k per year from what I've seen and no council tax for ~£1.5k per year, but also I'm living in a more expensive area than many engineers would so even £20k as a salary can afford a pretty good life in these kinds of areas. Once you get past that, if you don't have a family to support then you are just giving yourself more disposable income. For good finance jobs you will be in much more expensive areas where the value of your salary quickly diminishes.