I have no experience of using them, but I think it needs to be warm enough - which it should be now?

The grubs are what the nematodes attack - you'd see small white C-shaped grubs in the compost if you tipped it out for a bit - best to check whether that is the issue before spending money on them

https://www.rhs.org.uk/biodiversity/vine-weevil

Back to my usual 4 today 

The latest replies are what I was actually asking,  I have the telly on but only actually watch it if something  catches my attention. Three days a week I'm at home alone as I'm registered disabled  at the moment.  It's a  'noise' and a comfort.

Salmon fillet in chilli sauce with veg rice, banana and ice cream for pud 

Maggie Smith - wicked sense of humour.