Bicycle Storage at Central Station - safe?

I go into the office 3 days a week and to get there I have to get a train from central station. I live in Heaton, so was considering cycling to the station to try and get some exercise (and have to stop solely relying on the terrible number 1!).

Before I take the plunge and buy a bike, does anyone know what the bike storage is like at central station? From what I can see it’s just open bike racks which don’t fill me with massive confidence.

Or does anyone know of any secure bike storage nearish the station?