have lost some BBC tv channels TV/sat setup in France?

I have a SAGEM box that picks up signals from ASTRA 2 2A, 2B satellites. I can get a large number of channels, but over the last year have lost some BBC channels i.e BBC south east and BBC eastern. I think they should receive a signal at around 120.00 Mhz. The satellite dish in question is situated near Sarlat in the Dordogne- S W France. The system was installed locally last year. Is there anything I can do to get these channels back?