If you want to look seriously at switching to a new, modern GP System then there is a dedicated team in NHS England who will support you through the process.NHS England are planning to release a new tranche of funding in April 2024.
They are asking for applications to be submitted ahead of that, to allow them to be approved quickly when the funding window opens.
There are 2 main phases:
What to do next?
What happens after that?
There is more information (although it relates to an earlier funding tranche) here.