Previous repair has lifted causing a trip hazard

I have reported this problem previously regarding footpath between Brambling Walk and Whinchat Gardens. There is a group of sycamore trees growing in a corner of rear garden at 16 Whinchat Gardens. The roots of those trees have lifted the surface of the footpath previously and the City Council paid me compensation to replace my glasse when I tripped and fell. A repair was subsequently carried out which also necessitated the replacement of the garden fence at the above property. That repair (a concrete patch) has now lifted by approx 50mm (2 inches)and again presents a signicant trip hazard. Additionally I have noticed that further cracks are appearing in the tarmac surface, one of which is heading directly towards the foundations of my house. Further to that, my rear garden footpath has become significantly distorted and a reinforcing fence post has taken on a noticeable 'lean'. But my worst fear is that the tree roots may break into the foul waste drain which is directly in line with the new crack appearing in the surface. I believe the root action of these trees provide a significant danger to the drain and some urgent investigation and action need to be taken. I regret at this time I am unable to provide photographs.