We have 2 dishes, pointing at Astra 1 and Astra 2, and a Panasonic Viera TV. Each dish has 2 LNB feeds. We have a Humax Foxsat and have also just bought a Humax 5050, which is the French version of the Foxsat.
(When I was looking at my options for a box for the Astra 1 receiver I tried to find out what the dfferences were, and why the 5050 was so much more expensive, but the French email support line was pretty useless. I found out from other sources that the 5050 has a card slot for TNTSAT, which you would probably want, in order to get all the free-to-air French channels in HD. It's a card which you buy every few years, but there is no subscription to use it.)
I have them both connected to the 2 HDMI ports on the TV, and if both sets are powered up I can see each using the INPUT-AV button on the TV remote, which allows me to select various sources, including HDMI1 and HDMI2.
The issue is that the remote control for either box will work both of them at the same time, so one has to be powered down when the other is in use. I haven't yet wanted to do it, but there may be a time when I want to record a French programme whilst watching a UK one, or vice-versa. I think I am probably going to have to make a removeable cardboard mask or something for the infra-red receivers so I can have both sets on, but only one responding to the remote.
There may not be many people in this forum with the Humax 5050 but there might be one or two with 2 Humax boxes in the same room. I just wanted to check whether what I am thinking of doing makes sense, or if there is another way.