Hi LMV. We have had moths for a few years now. I have a good quality wool carpet throughout my house (fitted from an open plan sitting room, up the stairs, along landing). We have noticed that their numbers have been increasing a lot year on year and we are continuing the battle. Last year we managed to find the main nest. It was underneath a large log basket which we hardly ever move, but when we did we found the carpet had been properly munched.
I have used the sticky moth traps, available in Lakeland and Robert Dyas in Wimbledon, and these have been successful in trapping the moths. Unfortunately, it is not the moths that do the damage, it is their hatching larvae. We now have to regularly move furniture, because apparently, they like finding hatching areas under items of furniture that are rarely moved, because they like the dark, undisturbed places. We Hoover well and spray the carpet with moth-killing lavender scented spray, also available in the above stores. It has not eradicated them completely, but numbers are definitely down.