CCTV footage from the Tacolneston transmitting station, which transmits BBC radio and TV broadcasts, showed someone inspecting the area between 3am-4am.

Just before 4.30am, a ‘strong light source’ could be seen. Two hours later flames were flickering from the base of the mast before they were put out by a member of staff just before 7am.

The cost of the damage was around £1 million, Ms Robertson told the jury.
https://www.dailymail.com/news/article-15979041/Pro-Palestine-activist-set-fire-BBC-transmitter-causing-1m-damage-left-posters-calling-broadcaster-cowards-links-Israel-court-hears.html