Retaining Wall Design with PI Indemnity

I need a retaining wall designed to support clay earth. The wall will be 3 meters high and constructed using block and geogrid materials. It's essential that the designer has Professional Indemnity (PI) insurance.

Key requirements:
- Design must accommodate clay soil
- Use of block and geogrid materials
- 3-meter height
- PI indemnity is a must

Ideal skills and experience:
- Civil or structural engineering background
- Experience with retaining wall design and geogrid applications
- Knowledge of clay soil behavior and engineering solutions
- Valid PI insurance

Please provide relevant credentials and past project examples.