blimey, what a mess! and poor you! Im not surprised the landlord is acting like this, because at an extra 100 quid a month, its going to take her around 4 years to pay off the arrears! I am, however absolutely astonished that some one can not be in control of their finances to either not realise 1) you have an extra 450 pounds a month or 2) that someone isnt paying you 450 pounds a month when they should be. I think he cam legally enforce you to pay, as you are garuntor, but idonyt hink he can lump all 5ooo quid on you at once