1998 Vauxhall Astra Kn ocking noise on back wheel passenger

Tires and Wheels problem
1998 Vauxhall Astra Four Wheel Drive Manual 103000 miles

Hello,
I have a Vauxhall Astra 1.6. It is making a lot of noise I think at the back on the passenger side. When driving along it sounds like the wheel.

Please can you help!