Agree with various PP that all these will be significant:
double de-clutch
"Revenge is a dish best served cold"
the block of flats and phantom fridge thrower/microwave thrower
the wedding of the drug dealer
Catherine's friend/colleague - June?
Maybe also Claire and Neil's past history as drug addicts
the locked fridge and cupboards in the teacher's house
and probably many other clever bits of plot that I've missed.
Just finishing dinner, see you all on the other side!