Persuaded my pal to buy humax freesat recorder, but when he disconnected the Sky Plus box and put it on the dish he got the message "No or Bad Signal" yet the Sky was working last night. Help Please?

First thing to check is that you have connected one of the coax cables to tuner 1 in, not tuner 1 out.

Thanks Graham, I brought it to my house and did a factory reset. Then put his postcode in. I think it may have been blocked by the previous owners Postcode - plus it did a massive update after the factory reset.
Thanks for your help.