I have heard it's a very good course for computer science, and a lot of graduates who haven't done computer science use it to get their foot in the door. However, I don't necessarily think it's that much of a big deal to have it on your CV.
For one, it's specifically a certificate for completing the course (see the following for example:
https://cs50.harvard.edu/x/2022/certificate/); there's no proctor exam or any means of testing your knowledge. All you have to do is sit through the course, submit projects, and you get a certificate. If you go through courses on online learning platforms, you would notice a number of them offer certificate upon completion of the course. It means very little, other than saying you did this course at one point.
Second, it's not a professional qualification that is either used in the workplace nor does it specify your skills. Professional qualifications require the candidates taking the qualification to meet certain standards and adhere to certain professional requirements in order to be a recognised member of the professional body e.g. medicine, law, accounting. The above certificate does not offer anything of such.
Third, it's not likely to be widely known to UK employers what the course is or what it's about. If you want to include it in your personal statement for university applications, then yes I can see it being valuable and relevant (because academics are likely to recognise it). For apprenticeships though, I don't think it's likely. You might want a second opinon on this though.
By all means, do the course. I would recommend it, since the information you learn would be invaluale. However, I don't necessarily think the certificate would be that much of a deal
If you're looking for a cybersecurity qualification, I would recommend you look at the following:
https://www.itgovernance.co.uk/blog/what-are-the-best-qualifications-for-a-career-in-cyber-securityhttps://uk.indeed.com/career-advice/career-development/security-certificationshttps://firebrand.training/uk/blog/10-best-cybersecurity-certificationshttps://entrepreneurhandbook.co.uk/cyber-security-certifications/https://www.eccouncil.org/cybersecurity-training-and-certification-uk/https://hackr.io/blog/best-cybersecurity-certificationPersonally, I am a fan of CompTIA (recognised internationally), but you can easily go into SSCP and GIAC. These certificates will likely boost your chances of a job in cyber security as opposed with just a CS50 certificate or IT degree.
I don't know which specific role in cyber security you're interested in, so I have included the following links:
https://nationalcareers.service.gov.uk/job-profiles/it-security-co-ordinatorhttps://nationalcareers.service.gov.uk/job-profiles/cyber-intelligence-officerhttps://nationalcareers.service.gov.uk/job-categories/computing-technology-and-digitalhttps://www.careerpilot.org.uk/job-sectors/data-network/job-profileshttps://www.careerpilot.org.uk/job-sectors/data-network/job-profile/cyber-intelligence-officerhttps://www.careerpilot.org.uk/job-sectors/data-network/job-profile/it-security-co-ordinatorIn terms of data science, I have bad news:
https://www.youtube.com/watch?v=nhiw8ftAFZkBy all means, data science as a degree is useful should you wish to go into academic research, but you might have issues getting work in industry. However, that's only one opinon on the issue and others may disagree.
Software engineering will require an IT related degree, but it's often said you're better off doing a degree apprenticeship where possible.