I'm always saying this on various threads on here (cos i think it works!) but I go for the double pronged attack!

I surround my beds with copper (I used piping last year but for this year I've just bought 50 foot strips about an inch thick) and then use Nematodes. The copper stops them climbing in/out and the nematodes kill the slugs already in the soil.

I got one lot of nematodes last year but this year I've ordered 3 lots that are delivered at 6 week intervals. The copper is going to be screwed to the concrete slabs that surround my 2 beds. It was expensive but I think it's worth it if you can afford it - and I'm hoping it'll last a long time.

I don't sow much (if anything) directly into my plot 'cos I find I get many more survivors if I put in and cover seedlings. I'm already planning how to cover my brassicas - we have loads of wood pigeons stalking our garden