He tugged the chain hard, something broke, it stopped flushing.
After a spell of having to tip bathwater into loo to flush, he booked a plumber who visits.
I get home to find plumber did half an hour, removed broken thing, told him to buy new bit, clean inside bit with white vinegar and fit new bit to it. Then charged £35 and left.
We are currently standing in builders warehouse shop while he stares at internet and wonders round aisles.
Context - I work full time and run a side business. He doesn't.
AIBU to expect that between them they could have got the fecking loo flushing without all this 😡