[devonbarmygardener]

Diesel to kill everything and lime to clean/freshen everything!
Including spring water apparently!!

[yaxley]

Sure i read somewhere that ants dont like talcum powder .

[compostqueen]

Yes, but I was telling you what they use in Italy, where you live!    

[crh75]

Nemasys sell ant killing nematodes imaginatively called "no ants".

[compostqueen]

You did say the problem was in your muck heap.  I hadn't supposed you were growing crops on your muck heap 

[devonbarmygardener]

Compost heaps are a good place to grow squashes or courgettes!

[Ema]

I have a few black and red ants nests, I've just been leaving them to it but have to be careful of the red ants as their bites drive me crazy.

If there in the timber of your raised bed are they the bigger wood ants? I think these might be a protected specises