More Information for Defined Cos

Dear Friends,

I have applied for Defined Cos and HO has asked more information. There are couple of things. Everything is ok except one thing which is not clear to me. Please see below

Copies of current official contracts or agreements to demonstrate your business has genuine vacancies related to your current request. These should only include contracts which demonstrate a guaranteed agreement to provide services. Contracts which don’t confirm specific agreements, do not demonstrate a current and genuine vacancy exists.
You must highlight in the contracts the relevant clauses which confirm you have genuine agreements for services leading to current roles to fill.

Which contracts shall i provide? Is HO asking about contracts between company and clients or contract between employer and employees before hiring?
also which Clauses are required for this? does it mean Employment Rights Act???????

Thanks.