"British know-how and ingenuity".
In which case I hope they've a bloody big teapot and an awful lot of digestive biscuits.*
*One of the engineers working on either Blue Streak or Black arrow was interviewed about the project, he said something on the lines of when the Americans had a problem they threw money at it until they trampled it to death. We on the other hand went off to have a think about it over a cup of tea and plate of digestive biscuits!