UK Landlord Forum / Life

I've just had my 6 monthly update on my property and 1 of the 'items arising' was that the garden shed is in need of replacing.  they've quoted me £300 for a new shed.
my question is am i legally required to provide a shed?
I will happily repair the garden wall (although i'd quite like to know why its falling down all of a sudden), but i think £300 for a shed is a step too far.