Like motchen, if you don't mind it being outside, I have some space at my place.
I live in Kingston upon Thames (southwest London, so about 16 kms/10 miles from Waterloo station), and on a quiet residential street, in a refurbished mill that has been converted into 2 flats. There's security gate with a key fob that only myself, my neighbour, and my landlord have access to. Even when the gate is open, you can't see my bike from the street.
Also, if you have a battery trickle charger that you want to hook up, that can be easily set up.
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