Hello my name is Alex and I will help you with this. Please note that I am a working Solicitor and may be on and offline as I have to attend Court and meet with clients, even at weekends. As such you may not get an instant response when you reply as this is not an ‘on demand’ live service, but rest assured I will be giving your question my immediate attention upon return.
What is it you would like to achieve please?
advice on what to do next
It is criminal damage as your property has been damaged without your consent. The Police could, if you made a complaint, interview and prosecute your neighbour but that may not be the best for next door relations.
You should get a surveyor round to assess the damage. The surveyor can see if there is any lasting damage and what is needed to put it right. That would be the value of any claim against your neighbour at which point you could ask him to put the damage right. If he refuses then at that stage you would be entitled to issue proceedings in the County Court for the damage. You can do this online at: www.moneyclaim.gov.uk or completing form N1 http://hmctsformfinder.justice.gov.uk/courtfinder/forms/n001-eng.pdf and take it to your local County Court
If they refuse to remove the plank you could get an injunction to make them remove it - that way if granted by the Court they can not refuse as this would be contempt of Court. If they did refuse then they could be fined, or sent to prison or both.
Can I clarify anything?