I need a structural engineer who can verify installation methodology

We are a new start business operating from Chester le Street in Northern England
We are costing a range of newly designed products that require to be verified as suitable for installation underground under differing loading scenarios.
The new products will use an amalgamation of known materials with known strength characteristics.
Initially we are trying to understand what the estimated verification costs would be.
Any contract will be subject to a NDA being signed before any commencement.