City and Westminster Properties v Mudd - the lease of a shop, both parties knew the tenant would sleep in the back, new lease drawn up specifically said property could only be used for retail purposes, before lease was signed the tenant said 'will i be able to continue living in the shop' the man said yes, court said the lease didn't allow for residential use however there was a separate contract alongside the lease which was oral (collateral warranty) and that this had been breached