Hello Jaden Mulder,
Since the Surface shuts down before Windows starts, try opening UEFI: with it turned off, hold Volume Up, press and release Power, and keep holding Volume Up. If UEFI also closes after about 15 seconds, that strongly suggests a power, battery, or mainboard fault rather than a Windows problem.
For the repair service, please follow Microsoft’s How to get service or repair for Surface guide and try starting the order from your registered device. Since you are currently in the UK, you can also check Microsoft’s UK Authorized Service Provider information for an in-person repair through Currys. Contact the location before visiting to confirm that it can service your specific Surface under a warranty issued in the original purchase country, as availability and warranty coverage may vary. Microsoft also notes that an authorized provider may charge additional fees even for an in-warranty repair.