Payment on UK construction contracts runs on the Housing Grants, Construction and Regeneration Act 1996, as amended. Every contract carries a payment due date, a payment or default notice, a final date for payment and a pay less notice deadline, with the right to adjudicate at any time. Where the contract is silent, the Scheme for Construction Contracts fills the gap.
Not your whole portfolio. One live job, one certificate. If it does not save you time the first time you use it, walk away and take your data with you.