From the job profiles for the job:
https://nationalcareers.service.gov.uk/job-profiles/early-years-teacherhttps://www.prospects.ac.uk/job-profiles/early-years-teacher#qualificationshttps://www.careerpilot.org.uk/job-sectors/childcare/job-profile/early-years-teacherhttps://life-pilot.co.uk/job-sectors/childcare/job-profile/early-years-teacherYou would need a degree related to childhood studies that leads to EYTS (not all of them do), or an undergrad in any subject + accredited training.
do I just go for it and start by doing a foundation course in uni?To do foundation year integrated undergrad degrees, you would typically need 3 A Levels. They are normally designed for people who either did the wrong subjects (not applicable for the types of degrees that you are looking for) or for people who didn't meet the grade requirements. If you have failed your A Levels, foundation years don't apply.
The foundation year would usually lead onto the main undergrad degree that you would have been doing should you have gotten the GCSEs and A Levels that you needed. Transferring from one uni to another post foundation year usually don't work very well since each uni structure their foundation years to suit their individual degree requirements. Plus, the foundation year costs a full year of uni tuition at £9k per year (which would be funded for through Student Finance). It's because of these reasons that foundation years aren't normally recommended.
In your case should you wish to take the academic route, I would recommend doing an Access course (in any subject, since I am pretty certain that the degrees you are looking for don't require your A Levels/Access to be in any specific subjects but do check the entry requirements of each degree you want to apply for to be sure).
Since you have already done A Levels before, you will likely need to fund the Access course via Student Loans or yourself. If you do get student loans, it's the Advanced Learner's Loan that you need. These loans would only be available if you attend an offline college approved by the Student Loan Company (typically any adult community college or vocational college in your local area, since these are funded by the government).
I also need to retake gcse maths just makes my brain spiralSince you have a strong dislike for GCSE Maths, I would recommend double checking what the entry requirements are for the degrees that you want to do and whether you meet the GCSE Maths requirements. If they don't specify the requirements for GCSE Maths, it means there aren't any for the GCSE (you can check with the uni's undergrad admissions for the degree concerned to be sure).
However, should you need to resit your GCSE Maths (because it's grade 3 or lower), you should be able to do it for free at the same college that you intend to do your Access course from.
OR do I do an apprenticeship (level 3) in early years and then work my way up from there instead of jumping straight into uni and debtsYou can also try to work your way up, but it might take slightly longer to get to where you want to be.
If you want to take this route, you would be a nursery worker or teaching assistant and doing a part-time degree in childhood studies or child development.
In other words, you would likely need to do a degree apprenticeship, or your Level 3 should allow you to progress onto a Level 6 in childhood studies/development.