Frequently Asked Questions
If you wish to change those rules, you need to make those changes clear when describing what the method of measurement is. The tenderers are not obliged to check the bill of quantities to make sure that there are no errors in them. After all, the contractor is not your quality checker.
Clause 60.7 makes it clear that the contractor can assume that the bill of quantities has been taken off correctly when pricing the works. The lack of any qualifications cannot change the risk profile in the contract.