There is a local scouts/beaver/rainbow/brownies group at the Church Hall I believe just along the road from St James's Church itself - the contact telephone numbers are normally featured in the church magazine issue called ''Insight'' which maybe delivered to you if you actually live in the parish!
There is also lots of activities from trampolining to martial arts etc taking place at Graves Tennis and Leisure Centre which tend to attract many local kids !!
The Rose Garden Cafe within Graves Park often has a 'storytelling' session by a local grandmother for young children too - you could always ask the staff there for more details etc
Woodseats and Greenhill libraries are also a good source of information for local activities/groups for kids!
Hope this helps and welcome to S8.