Once again we compile the most senior, surprising and influential job moves in the UK.

This time we cover a switcharound at the top from RIM, a new digital lead at Channel 4, the creation of a new role at O2 and a jump from agency to in-house at MTV.

Research in Motion has replaced co-CEOs Mike Lazaridis and Jim Balsillie with Thorsten Heins, formerly COO.

Sainsbury’s has appointed former Heineken marketing director Sarah Warby as its own marketing director.

Channel 4 has appointed MEC’s head of digital strategy Carl Read as digital lead, replacing Ed Couchman following his move to Facebook.

Universal Pictures has hired Nintendo’s marketing director Dawn Paine as vice president of marketing.

Future, the specialist magazine group, has hired Nick King from News International as digital commercial director.

Saatchi & Saatchi has promoted Leigh Thomas, its head of account management, to UK managing director.

TwoFour has bagged the BBC’s head of crossplatform productions Martin Trickey as its new digital creative director.

Moo.com has appointed Dan Rubin as its global creative director.

O2 Media has brought in IPC Media audience insights head Andy Marrs as market insights manager.

MTV has hired Jo Bacon, former business director at RKCR/Y&R as its VP of marketing, creative and publicity for the UK & Ireland.