Steriliseing soil

Thanks for that Eyren, I must give that a try, though evedently I won't be spending that amount of money on it, especially when I can get seaweed for free

Lucky you! Nowhere here to get seaweed, unless we take a trip out to the Suffolk coast. Which is a nice day out, and worth considering once it's OK to travel for leisure purposes again (although I'm sure everywhere will be crammed with people taking advantage of reductions in lockdown).