On Friday, the main tenant wrote an email to our letting agent which might as well have been in semaphore for all the sense it made, but through the nonsense she managed to advise that this is a 'joint' agreement and so Insert-Surname-We've-Never-Come-Across is also responsible for performance.  Our response was emphatically "Who is this person?  Our tenant is [let's call him] Nigel.  Are these