* Excavate within the front garden area in front of the retaining wall to expose the existing stormwater line. * Carefully tunnel beneath the retaining wall where required to gain access to the existing stormwater pipework. * Expose and remove the existing RHS-to-PVC adapter connection. * Extend the existing PVC stormwater pipework out beyond the retaining wall and into the grass area. * Cut back the existing RHS stormwater pipework to the grass area and install a new connection. * Connect and seal the new PVC-to-RHS connection to ensure a secure and watertight join. * Concrete encase the connection in the grass area to provide additional support and protection. * Backfill the excavation and reinstate the affected garden area as neatly as possible.