Ideas for secure outdoor storage for bike

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At the moment DH puts his bike in the hallway under the stairs. It takes up all the space. I need it out of my house!

Can anyone suggest a secure outdoor storage solution for the bike? Can't do sheds as my back yard is small.

A bike rack the bike can be locked to and a cover out over it? Put a lock on the back gate if there isn't one already and maybe some trellis on top of the fence/walls to make it difficult for anyone to climb over.

Or perhaps one of those Keter storage cupboards you can padlock?

Oh thank you. I was looking at metal sheds and they cost £500+. I didn't think of plastic ones! Found a Keter for under £300. With some good padlocks I hope Itll be secure.