Weak signal on TV

Is anyone else receiving the 'weak signal' message on their freeview tv? My sister and her family are staying in our apartment this week and brother-in-law is panicking about not being able to watch the grand prix on Sunday! We're not sure if it's a dish problem or a tv problem. Don't want to call someone in unless its necessary. Any advice, anyone?

We're not having a problem (although have lost the Food Network channels!!!).  All other channels seem fine - but I can tell you that I kept on losing the signal before only to discover it was our cable/connectors.  The slightest tweak on the cable connectors to the sky box got the signal back.  Don't know if it's the same problem, but worth checking out.

If it's a box problem or something, let me know - we're F1 fanatics and will be watching on Sunday so he can join us!!  Send me a pm if necessary!

Edited to say:  Lost channels now back!  So definitely not a signal problem.