That's not what's happening in Greater Manchester - the ballot papers are being verified in each borough but all the actual counting is taking place at
the G-Mex Manchester Central the following day.
In order to reduce costs the returning officer recruited the entire counting team from the Salford mayoral election in May, as they are the only people in Greater Manchester with experience of counting SV; then the returning officer decided to spend money training SV to all the counters, including the Salford team.