Answered: NEC ECC: Compensation for owned plant not used due to delay in access date

I can see the injustice from your - the Contractor's perspective - of this.

However, from a strictly contractual perspective, you are paid in accordance with Equipment 27 of the Shorter Schedule of Cost Components, namely "at competitively tendered or open market rates".

Agreeing what this 'principle' means in practice might be tricky for specialised Equipment, but that is the contract you signed up to.