Just a brief update should anyone be in a similar position.
We rushed out and bought some of Rent*kill's Clothes Moth Killer Papers and stuck them in all our wardrobes.
We have been away a little over three weeks and on checking my woolens, including a fair few cashmere sweaters.... no holes or nibbled bits!
It may be too early to crow as the little blighters are probably devious and just waiting until I relax but... at first glance this seems to have worked and I do feel I can recommend them.
They were oh so easy to use and if they last the six months that is promised, I think this is an excellent product.
Rapunzel100, many thanks for your kind advice. I am very grateful.
Re painting metal bistro garden set