[heero_yuy]

Quote from Taf:

The "radiation" they used to detect came from the aerial, they detected an active local oscillator. These do not exist in digital TV's. Picking up screen signals is easier than you think, hence so much security shielding around military commcens, including isolated mains lines and earth points.

An interesting conclusion from a paper on this:

Each of these observations means a substantial complication
for anyone who wants to separate a compromising LVDS
signal of an LCD TV from background noise through periodic
averaging. The high diversity of the timing parameters
and the jitter on the synchronization signals also makes it
difficult to envisage an automatic TV detector predicting from
a broadcast TV signal the LVDS emanations of a TV set,
in order to detect them at a distance using cross-correlation
techniques, especially if the operation of the TV set is driven
by its own crystal oscillators and only loosely phase-locked
with the frame rate of a broadcast signal. Moreover, simple
EMC measures, such as careful layout and ferrite rings, can
substantially reduce compromising emanations from display
controllers and LVDS links.

I think we'll end up paying a "BBC Tax", then after a few years the government, still strapped for cash, will introduce a tax covering all forms of signal reception. With a name such as Digital Access Tax.

Sounds pretty likely, probably paid as a surtax on any subscription or BB service. Who gets the cash is less predictable as El Gov might just want to pocket the lot.