Subletting warehouse space

[nsa]

I'd like to rent 500-1000 sqft of warehouse space for a photography studio in Reading. I am looking at units but would consider subletting space. Can anybody tell me if this is practical from the occupier's point of view in terms of invalidating their insurance / planning / too much trouble etc, or is it a practical alternative? Commercial rents are £10-12 per sqft per year for my own unit; I was hoping subletting would be substantially less.