As lay people how can we know if a rewire has been done correctly?

Radial circuits

Radial circuits are ok provided the correct calculations are carried out and consideration is given to load, over current protection for the cable and suitability for the design. It’s no accident that your sockets are wired in a ring configuration, the load changes depending upon what’s plugged in. Final circuits eg radial to an oven or hob etc tend to be a fixed load so a radial is designed is isn’t likely to exceed the design current and so one cable will suffice. If you can run one 4 mm to a kitchen to form a radial for three or four sockets, it’s just as easy to run 2 x 2.5 mm. Having said that I’ve just finished a three phase installation to a six bed house that has 48 single phase circuits. Sockets in each individual room are radials to their own RCBO. lighting the same. Wouldn’t want to pay for the gear but does offer fantastic isolation. In essence, radial is fine provide correct design is adhered to Edit. LC not all radials have to be 4mm 32A if so I’ve buggered up several hundred thousand lighting circuits, boiler supplies, freezer supplies, showers etc etc etc 😊

I am sorry to comment on your questions but what I would advice you is do what electrical installation law says and to keep yourself and your property safe you must always allow maximum demand and diversify which is the basic electrical installation and wiring regulations, you can not just calculate your cable for what you have now with limitations. Therefore I would advice you to go for a ring circuit which would give you a safer installation and more room to improve. Again you can find more information about maximum demand and diversity in appendix A onsite guide 18th edition. Which will help you a to decide. Hope I have type correctly and I have just given my opinion :)))) Aswad