Wander00
My younger brother was/is a chartered management accountant in the defence industry. For many years he worked for a company in Cheltenham but then created his own consultancy which had essentially one client -- HMG. He focused on high value single supplier contracts.** Some of the work he was involved in was so interesting he could not even take a mobile phone on site.
** An example being lets say a US stealth fighter. He would fine tooth comb every line of the contract and then visit the manufacturers and check the facts.