Further to earlier posts #153-158.
Following the recent change to LCN 8 and 64, I tried tuning the bedroom TV again on ch 29 and up popped 8, 64 and 791 with decent signal strengths. Set top aerial and nothing has changed here since the set's original refusal to "see" anything on ch 29. There must have been a change of transmission characteristics that has enabled it to show up on my cheapo set. Ch 29 from Crystal Palace is predicted not to radiate southwards (unlike the yet-to-be-commissioned Croydon transmitter which will), but I notice reception reports from much further south than here (I'm 3 miles south of CP). Who said RF is a black art?