Can't repair my property due to the persons next building a conservatory which is 4 inch between wall to wall

Question:it is hereby agreed and declared that all walls and fences dividing the property from the adjoining property on the westerly side thereof are and are and shall at all times hereafter for all purposes be treated as party walls and fences and that as between such adjoining properties all rights of way light air flow of water and soil drainage and other easements or quasi easements shall remain and be enjoyed as the now exist or are enjoyed or have hitherto existed or been enjoyed under one ownership. this is written in my deeds please can you tell me what it means. thank you .Andrew

Answers:
have they built a new wall that wasnt there previously? is it blocking your light? your air? your right of way? if they have and you previously had room to move blah blah i suggest you take legal advice - they should have the same covenant in their deeds - so you have a good case.