I can have an answer emailed to me in a couple of days.
Quite right N. MoD did have such a (mandated) process, but we were told to cease it in June 1993. It's still used, entirely unwittingly(!), by a flagship Infantry programme. But I've seen a recent Aircrew Survival Equipment contract that doesn't call it up. Presumably nobody in the IPT realises the contract is a crock as they posted it on the internet. The process is simple. Named engineer at Air Station in contract (it was a C/T at Wyton, for example, on Nimrod R SRE). Design Authority could accept a phone call from him, and intermediately start work without further approval; up to a specified limit which equated to man-hours. This gave the Technical Agency time to formalise. Commercial or Finance not involved at any point. On R, there was sliding scale as an incentive. Big bucks if you cracked it that day. Less if 24/48 hours, and so on. SFA if you screwed up.