Vauxhall Astra Life - horn, radio & central locking not working.

Hi all,
Newbie here.
We've got a Vauxhall Astra Life (2004) which is a nice little run around car but we've got a wee problem. For some reason the radio, horn and central locking no longer seem to work. Thought about changing the fuses but for some reason my gut feeling says its something more than that. Can anyone suggest what else it could be?

Any suggestions welcomed.
Thanking you in advance