When we got to Greece we waited for our case to come through but, along with about 20 others, it didn't show. One of the baggage staff told us about the problem at Gatwick and took all our details.
Fortunately we had hand luggage, including the wife's little wheely case that goes on as hand luggage and we had managed to a couple of days worth of pants/shirts into it, as well as swim stuff and shoes. We were also lucky in that we know the lady who runs it very well and she loaned us a couple of towels for round the pool so all we had to buy was soap, shampoo, toothbrushes and sun cream. Bloke next door lent me a pair of flip flops too
Learned a couple of lessons though : put flipflops in hand luggage and spare shoes in suitcase.
I was amazed that one couple at the airport said "But my epilepsy medicine is in that case" and people on twitter were saying they had nothing to wear at all.