I would recommend topping the BTECS up with A Level maths, since it's a required subject. However, you can look at the entry requirements for the following:
Software engineeringhttps://www.salford.ac.uk/courses/undergraduate/software-engineering (DDM in IT/Computing preferably)
https://www.birmingham.ac.uk/undergraduate/courses/computer-science/computer-science-software-engineering.aspx#EntryRequirementsTab (you would need to check with the unitversity, but it's likely that they will require A Level Maths)
https://www.port.ac.uk/study/courses/undergraduate/bsc-hons-software-engineering#entry_requirements (DDM, needs to be in a relevant subject)
https://www.southampton.ac.uk/courses/software-engineering-degree-beng#entry (need A Level Maths)
https://www.westminster.ac.uk/computer-science-and-engineering-courses/2023-24/september/full-time/software-engineering-beng-honours#entry_requirementshttps://www.sheffield.ac.uk/undergraduate/courses/2023/computer-science-software-engineering-beng#entryreqs (DDD in applied science, engineering, or computing/IT + A Level maths)
https://www.mmu.ac.uk/study/undergraduate/course/bsc-software-engineering/ (BTEC needs to be in Computing/IT, but can consider Applied science and engineering on a case by case basis)
https://www.cardiffmet.ac.uk/technologies/courses/Pages/Software-Engineering-BSc-(Hons).aspx (DMM)
https://aru.ac.uk/study/undergraduate/software-engineering#entry_requirementshttps://www.uclan.ac.uk/undergraduate/courses/software-engineering-bsc (DMM)
https://www.qub.ac.uk/courses/undergraduate/software-engineering-placement-beng-g604/#entry (D*DD if science or engineering BTEC, DDD if computing)
https://www.ulster.ac.uk/courses/202324/software-engineering-30734#entryconditions (DDD)
Computer Sciencehttps://www.city.ac.uk/prospective-students/courses/undergraduate/computer-science#accordion502079-header2 (D*DD in computing/IT only)
https://www.manchester.ac.uk/study/undergraduate/courses/2023/00560/bsc-computer-science/entry-requirements/#alternative-entry-requirements (D*DD with A Level Maths)
https://www.qmul.ac.uk/undergraduate/coursefinder/courses/2023/computer-science/ (BTEC needs to be relevant to computer science)
https://www.southampton.ac.uk/courses/computer-science-degree-bsc#entry (need A Level maths on top)
https://www.surrey.ac.uk/undergraduate/computer-science#entry (DDD + A Level Maths)
https://www.birmingham.ac.uk/undergraduate/courses/computer-science/computer-science.aspx#EntryRequirementsTab (need other qualificatins on top)
https://www.exeter.ac.uk/study/undergraduate/courses/computerscience/comsci/#entry-requirements (DDD + A Level maths on top)
https://www.northumbria.ac.uk/study-at-northumbria/courses/computer-science-bsc-ft-uuscsi1/#entry (DDM)
https://courses.leeds.ac.uk/f919/computer-science-meng-bsc#entry (D*D*D with Distinctions in all Mathematics units. Mathematics units must include Further Mathematics.)
https://www.ox.ac.uk/admissions/undergraduate/courses/course-listing/computer-science#content-tab--3 (DDD + A* in A Level Maths)
https://www.lboro.ac.uk/study/undergraduate/courses/computer-science-bsc/ (D*D*D + A Level Maths)
https://www.aston.ac.uk/study/courses/computer-science-bsc (DDM)
Cyber Securityhttps://www.uwl.ac.uk/course/undergraduate/cyber-security?start=646&option=33 (DMM)
https://warwick.ac.uk/study/undergraduate/courses/cybersecurity/https://www.mmu.ac.uk/study/undergraduate/course/bsc-cyber-security (DDM in IT or Computing. Applied science and Engineering would be considered on a case by case basis)
https://www.bcu.ac.uk/courses/cyber-security-bsc-hons-2023-24#entry_requirements (DDM in a Technology, Science, Mathematics or Computing related subject)
https://www.dmu.ac.uk/study/courses/undergraduate-courses/cyber-security-bsc-degree/cyber-security-bsc-hons.aspx (DMM)
https://www.gre.ac.uk/undergraduate-courses/engsci/computer-science-cyber-security-bsc-hons#entry-requirementshttps://www.brighton.ac.uk/courses/study/computer-science-with-cyber-security-bsc-hons.aspx (DMM, also a joint computer science degree)
https://www.aston.ac.uk/study/courses/cybersecurity-bsc (DDM)
https://www.bathspa.ac.uk/courses/ug-cyber-security/ (DDM)
https://aru.ac.uk/study/undergraduate/cyber-security#entry_requirements (BTEC needs to be in a related subject i.e. IT/Computing)
https://www.ucb.ac.uk/study/courses/undergraduate/cyber-security-bsc-hons-fdsc/#entryRequirements (DMM)
https://www.winchester.ac.uk/study/undergraduate/courses/bsc-hons-cyber-security/ (DMM)
https://www.lancaster.ac.uk/study/undergraduate/courses/cyber-security-bsc-hons-i900/#course-entry (DDD)
There are other degrees out there, and I am not bothered to go through all of them to prove that it's possible to go into a degree with BTECs. If you want to check for all of them, you would need to do your own research.
If you insist on getting a degree in cybersecurity, then I recommend getting on that is NCSC accredited:
https://www.ncsc.gov.uk/information/ncsc-certified-degrees#section_1 If you want to get a degree in computer science or software engineering, go for the ones that are recognised as bachelor's in engineering (BEng) as opposed to a bachelor's in science. These degrees are recognised by the engineering council (see:
https://www.engc.org.uk/professional-registration/why-become-professionally-registered/). Whilst it's not much of a biggy, it can help with getting certain jobs in engineering.
I am having problems finding universities in Scotland, Wales, and Eire. It seems BTEC is only accepted in England and Northern Ireland, should you want to only study within the UK (BTEC is accepted abroad in some countries).
Do note, you don't need a degree (let alone any qualifications) to get into tech. See the following:
https://nationalcareers.service.gov.uk/job-profiles/cyber-intelligence-officerhttps://nationalcareers.service.gov.uk/job-profiles/it-security-co-ordinatorhttps://nationalcareers.service.gov.uk/job-profiles/software-developerhttps://nationalcareers.service.gov.uk/job-categories/computing-technology-and-digitalI would recommend looking at the following for certifications as alternatives:
https://www.bcs.org/qualifications-and-certifications/certifications-for-professionals/ (BCS is the body for jack of all trades in the IT sector)
https://www.itgovernance.co.uk/blog/what-are-the-best-qualifications-for-a-career-in-cyber-security (CompTIA Security+, CEH, CISMP, CCP, CISSP)
https://www.prospects.ac.uk/jobs-and-work-experience/job-sectors/information-technology/cyber-security-training (CEH, CISSP, CompTIA Security+, Certified Network Defender, CCSP)
Often apprenticeships are a better route into the role.
The only time when you have to look into a degree is if you want to become an academic researcher in IT. Otherwise, it's a nice qualification to have to apply for IT related jobs, but employers tend to care more about your skills and experience than your qualifications.