To add, Building Regulations in general state what one way of complying.

For example ONE way is light switches below 1200mm from finished floor level, you can instead use PIR or wireless solutions. You can even use a different figure where it can be shown that is more appropriate for the usage.

One person who has a "Japanese disabled solution" has things below 450mm because the entire downstairs is cushioned as they rejected wheelchair & hoisting & banana boarding. Instead they "3 legged" around the downstairs and are VASTLY more active as a result, they are physically fit rather than merely battling bed sores, obstinate care agencies and horrendously abysmal to superb O/Ts. That extends to the toilet, it is little more than a Japanese style hole in the floor, specially built for them, but a long way from bed-pan or "stuff a tena pad in your pants".

They were an architect... on a motorbike... and their own fault.