[gottago]

The argument that I think was made about lists of contestants not being available - well that didn't stop the police with the John Cooper case, and while we'll never know if they did or not, presumably somebody from the police went to ITV for a copy of the Bullseye episode he was on (for authenticity I presume) and I suspect they found the material relatively quickly.

Don't know how true to real events the drama was but The Pembrokeshire Murders had the ITV Wales reporter locating the episode of Bullseye - or at least getting the ITV Archive to find it - rather than the police.