First off, you don't say how old the car is, how long you've had it, if it's under warranty, got full Ford service history ... all useful bits of information. It could be 18 months old with full FordSH, for all we know, in which case Ford will almost certainly be liable for the repairs.

If out of warranty, then I'd suggest getting it in to an independent garage, and getting the fanbelt replaced and everything checked over. It's entirely possible that no lasting damage has been done - motorway runs do a great job of cooling an engine.

motorway runs do a great job of cooling an engine.

What the OP refers to as a "fan belt" is actually the "auxilliary drive belt". It drives such items as the alternator, air con, power steering (depending on type). This belt has not driven the fan in a British Ford since the Sierra died in about 1992.

Universally cars now have electric fans for cooling.

On motorways the ram air effect cools the engine sufficiently with no need for a fan.

If the belt had come off while driving an idiot light would have illuminated to show that the alternator was not charging. The OP makes no reference to this.

Our Focus needed a new belt after about 4 1/2 years. It was showing signs of cracking. Only cost about £40 including fitting.

Curious - only two words of my last comment there!

.......This is almost unbelievable. The cam and ribbed belts on our 15yr old 100,000+mile Focus still look fine, although I give them a squirt of belt dressing every couple of years, though.