Wigan Album

In this particular church, the Chancel begins where the officiant's desk to the left is. It looks as if there are a couple of rows for the choir behind that - with the pulpit in front of the pillar. The rails stretching in front of the altar mark the sanctuary area (it looks as if the choir pews run up to the three-panelled section to the left of the reredos behind the altar), which is a bit unusual, but there may have been space constraints.
The rows of pews in the foreground are in the nave.

If (and it's a big 'if') I remember rightly the wooden reredos now sits in the St Thomas Chapel at St James with St Thomas, Poolstock.

Yes, the central section, at least.