Bath leaking from poor hotwater pipe connection

[Berrega]

I have just bought a house. When I have a bath water comes through my lounge ceiling.
I copper hotwater pipe rises through the floorboards and pushes into a white plastic z section. This z section then pushes into the flexible metal hosing that attaches to the hot water tap.
When the bath is full of water, either water pressure, heat, or weight of the bath causes hotwater to spray up the pipe and run backdown he pipe and through my floor.

Any help and suggestions would be appreciated.

 

[Bahco]

I would employ a plumber to renew your pipework. It doesn't sound very healthy