Not really an AIBU but traffic is high here so...
My folks have been trying to sell their house for 18 months, the next door neighbours have a dirty old caravan parked in their garden, nearly every viewing they have had has told the estate agents that the house is lovely but they are put off by the state of the neighbours front garden/caravan (it really is bad and can be seen on google maps)
is there something legally my dad can do to get them to shift it?