On 25 August a special 3-D episode of Chuck ("Chuck Versus The Third Dimension") will air on Virgin1 @9pm. I was worried that Virgin wouldn't make an effort to ensure British viewers see the episode as intended (requiring those red/blue 3-D glasses), but thankfully I've been proven totally wrong...
In the 18th August edition of TV & Satellite Week, a free pair of 3-D glasses will be included with that issue. Virgin1 themselves are giving away 1000 pairs of 3-D glasses, on a first-come-first-served basis, through their website. You just have to enter your details for a chance to get a pair -- so, hurry!
