Just had another try with the dish. It's is useless for 2E/F right now.
Yesterday before the "crash" at around 10:20 I did some records for signal level with my humax 5700:
BBC1, 2 etc. : 33 - 35%
BBC3: 27 - 28%
ITV1,2, etc: 27 - 28%
ITV3: 29 - 30%
E4, more4, E4+1: 30 - 33%
Channel 4, film4...