Please be aware before ordering that due to the time of year and the extreme heat, some plants may be marked, burnt or even cut back in some cases. This will not harm the plants in the long term.
As seen during our appearance on BBC Gardeners World we use garlic wash as a slug deterrent on the nursery. Please find below the recipe that we use and find very effective. The quantities aren't exact and you can always alter them as you wish.
Open a window because it's going to get garlicky!