The website above seems to give only childminders, nurseries and playgroups - places where you leave your child while you go and do something else.
Toddler groups, where parents stay with their children and meet other parents are also members of Pre-School Learning Alliance (tel 020 7833 0991). The website doesn't link to local groups, but try google - toddler groups and your County. (or preschool and county)
Or try
http://www.netmums.com/
If you go to a toddler group you find that everyone is in the same boat, everyone is a bit shy and nervous at first but willing to be friendly, and you can all work together to make it a good place for the children, e.g. seeing that a child is playing safely while Mum makes the tea; helping keep the equipment clean and safe; deciding what new equipment is needed and raising funds.
At 10 months your son will be playing alongside others rather than with them, but you will make friends, who may share childcare so that you look after 2 children for a short while and get a few hours off in return. Your son will gradually learn to make friends, take turns and share toys. This will be so valuable when he starts school, and earlier.