Change and newness bring with them youth and inexperience.
On the day reality strikes Team Brown with a vengence, they may ponder that if this bomb plot had been identified three days ago they would have been led by a prime minister with 10 years experience of terrorist threats - not least the plots of 7/7 and 21/7 - and a Home Secretary who could draw on his experience of Northern Ireland, Defence and a year at the Home Office. Gordon Brown and Jacqui Smith will be having to learn very fast.
A day after this reshuffle I am struck by the inappropriateness of the phrase "first amongst equals" for Gordon Brown. There are few equals round that Cabinet table. Not only does he not, like Tony Blair, have "a Gordon Brown" - he doesn't have a John Reid or even a Charles Clarke.
In recent years Mr Brown's always leant heavily on the two Eds (Balls and Miliband) and Douglas Alexander. Today's a reminder of the fact that though he has appointed no deputy prime minister he will be more and more dependant on the three "grey hairs" who walked into Cabinet together yesterday - Alastair Darling, Geoff Hoon and, most of all, Jack Straw. Straw's spells at the Home and Foreign Office and his confidence in parliament will surely make him the deputy prime minister in all but name.
UPDATE, 1420: So the new home secretary is to be backed up by Falklands war hero and former head of the Navy, Admiral Sir Alan West, as her new deputy responsible for security. West was the man who insisted that Nelson be remembered properly and pushed for major celebrations of the 200th anniversary of the Battle of Trafalgar.
Speaking of Nelson he said : "We love Nelson because, like real heroes, he was not perfect. He could be vain and he had his flaws - he even suffered from seasickness. But he was brave and inspired the deepest loyalty, and when it mattered he got it right." Let's hope this last bit applies to West himself.