to the OP to comply with BS7671 you would need to do at least r1+r2/polarity/continuity, Ze test, maybe even volt drop calculation etc the point is the most important part is the testing after the design. There's a lot to it and competence pretty much requires it.
I have been previously shot down for saying that if you have a multimeter and know what to do, you can do a lot better testing than with nothing at all, polarity and continuity being the main ones. Also there's the physical pull out test you only need pointy pliers for that. It's true that it's not ideal and won't prove compliance with BS7671 or part p, but it's better than nothing regardless of how many disagrees I get.