Can the view from my unit be protected?

I am surprised that this issue has not come up before but I could not find a reference in searches here.

I would appreciate some advice as to my rights under strata law re the following situation: 

 Our unit has about a 7 degrees view of parkland and water when standing on our balcony at the rear of a 6 unit block. Unfortunately this view is seen by looking over part of another units balcony (about a 2 metre wide space) that is located about 20 metres in front and to the side. The rest of our view is occupied by blocks of flats, so the small view that we have is extremely valuable to us, and we have made this known to the owner of the front unit at different times when they have placed large pot plants in this area

However they have now replaced the plants with a large barbecue that blocks out more than half of our small slice of view. To make matters worse (I know, we must have really upset them , but we can’t figure out why) they have now taken to lifting the lid of the barbecue and leaving it up all weekend, thereby blocking our view completely! We have tolerated the barbecue being there up till now out of not wishing to get into an argument but now it seems they have reached a new level of pettiness. 

I am now about to write them a letter asking them to remove the barbecue to another part of their large balcony but would appreciate it if anyone on the forum could advise me if I have a case to take this to Fair Trading if my letter gets no results (as I suspect it will.)