You’ll be fine with all domestic. An EICR is good but really ensure your report is accurate as my inspector even had me working out csa and copper equivalent of a 6mm steel bolt. No need for commercial as some ACs never do anything but domestic. The engineers are pretty good guys and don’t mind if you have a few gaps in knowledge, as long as you’re safe and working to a good standard, and you know where to find what you don’t know you will be golden. Always get them talking about their work history as it fills the awkward spaces between jobs etc. Good luck
Thanks for the advice mate I’ll bare it all in mind