Posted: 18/09/2014 at 20:48
Meant to add: garden centres and seed stores will sell garlic, but we've had good results from ordinary kitchen garlic from a local greengrocer. Look out for Isle of Wight varieties, or possibly French, rather than(say) Chinese, which are less likely to do well in our climate.
Onion sets are available from garden centres etc from early spring. Small local traders (hardware/garden stores) often sell them loose so you can buy exactly the number you want, but sometimes you have to buy by the bag.