Call your local engineer
Often one of the main problems experienced during the summer months especially, is the prolific growth of roots, trees, bushes and shrubs. These can grow into the drain where they receive water and nutrition making them grow even faster.
If you experience a drain blockage it is important to ensure the drain is inspected with a camera once the block has been cleared. If the blockage is found to have been caused by roots it is important to remove the roots and repair them to stop them getting back into the drain systems. If roots are not contained, they could grow and cause long-term damage to the drain.
The video below uses CCTV surveys to allow the Drain Doctor technicians to see exactly what is happening under the ground without having to dig up the pipes. In this case the pipes were evidently affected by root damaged and needed repairing.