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You would not be in breach of clause 19 but you would be in breach of clause 18 of the lease so you would need to get the landlord's permission as cookery classes, photoshoots and b & b are businesses which you would be running from home. So that would make it not OK to do these things from within your home. Happy to discuss further. I hope that helps. Please leave a positive rating so that I am credited for my time.