[Madhatter]

Town council has three wards here north central and south, borough has three wards north central and south, any councillor can be just on borough, just on town or on both according to which elections they stood in and for which wards, and not necessarily the same wards if they stand for both. they don't even have to live in any ward, as there are other reasons that entitle you to stand in a ward such as working there. What you are standing for is a seat in a ward on a borough council.
Parish councils dissapeared a good while back during reshuffling I believe. A lot of their power was given to borough and town took over what was left. This is of course now reversing in a lot of areas.
A town council should still have a parish meeting once a year though were the whole parish is invited to ask questions about the parish as a whole, which will then get passed on to the relevant council be it town borough or county.