in your list of 50, not sure what 8 is. Bron/Broen=The Bridge. The white roller is "A Touch of Cloth" (police markings not shown) I've got a pic of the roller with a man siting on the front - looks like the "Quizzer" has airbrushed him out & put Engelbert on it. 13 (weather vane) I think isn't a clue, but above it is "Titanic" (4 funnels). I agree the earlier suggestion is correct of the Constellation of Orion = The Hunter=Sam Hunter=heroine of "The Hunted". If it was The Sky at Night I feel a full sky panorama of many signs would be shown. All good stuff, gets us all going ! 'By the cell 'anagram= Bletchley so i think it refers to "Bletchley Circle" think that's 50 ! All the best to you FireyColin for starting the fun and and also to the great minds who put their 2 pennyworth in as well.