When Nick Clegg went on Desert Island Discs after the election, he told the tale that when he was considering joining David Cameron in a coalition government, he texted a mutual friend and asked him, “Can I trust this guy?”

As Guido revealed for the first time in the Sun on Sunday yesterday, the friend who told him “yes” was Tim Luke. The Old Etonian who vouched for David Cameron is in a way responsible for bringing this coalition government together. Luke’s previous claim to fame was hitting the headlines for walking in front of the camera while James Corden was presenting the Brit Awards.

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The PM later appointed him to No.10’s policy unit. Could Tim’s leaving party next week – he’s off back to Barclays investment bank – be a sign the coalition is beginning to prepare for the end?