WHat freckle says is completely true - but above all honey you need to go see a solicitor and get this put down legally (could have him put down by your friendly gun man too!!)
As for the tax - that is not even taken into account when it comes to a divorce settlement apparently so that bill is his and his alone!!
Go and see a solicitor - say he has been phoning threatening you - I am sure Soupy has heard him do so (And I could have too is needs be!!) and he has been violent to you and DS in the past - show said SS report - that should be all you need to get an injunction.
Oh Fuck it - please just get one for peace of mind and to show him next time he threatens you - how can he be such a complete TOSSER!!!!!!!!!