HyppyByker, I'm in the same boat - exactly the same, and I garden organically too- the one difference is that I have used the compost - I just thought 'what the hell' and I've loads of ladybirds, although I haven't seen any lacewings yet, just thought they would have a feast. I have two greenhouses, one heated and one not...I used the compost (mixed with leafmould and shreddings - both well composted) and there doesn't seem to be any problem in the unheated greenhouse, but I do have lots of greenfly (no whitefly) in the heated greenhouse, but I overwintered plants in there so I presume, the greenfly overwintered too. Watch out using boiling water or you'll kill off the goodies in the compost bin too. All those worms, slugs, woodlice and the trillions of good microscopic bodies that all help make the compost smell sooooo sweet and sooooo good in comparison with that we buy.