Student Finance England does indeed have restrictions about funding if you're living abroad. What worked for me when I moved was maintaining a formal address in the UK while studying remotely. This way, I still qualified for their support, which was crucial for my finances during my masters.
Preparing for the relocation costs is also key. When I moved, I used this resource to gauge expenses:
It’s aimed at moves from the USA to the UK, but it helped me get a rough idea of what international moving expenses might look like, which was incredibly helpful in budgeting my move.