Hello Dave,
I know how difficult it is being a single parent all the time and being the only person the children interact with. Of course we can do all those things mentioned above but we are social beings and want to be with other people as well, chatting, laughing. I live up north, so I don’t know about Somerset. Here our library provided until corona hit regular events for children on weekends. Look for lego and chess club, pokemon, athletics and football. That is all weekend activity. Worth a try is family service in church on Sundays at 10.30 or 11h. If you have a UNI around, there are usually cultural activities during the weekend for children. Try to get on the mailing list for the arts department. Look for a parkrun in your area, they are about to restart. If there is a big playground in a park go there at the same time usually Saturday 15-17h and Sunday 13-16h for a few weeks. Most parents are habitual beings. I hope this helps a bit.