In the early hours of a Sunday / Monday morning in the centre of Manchester, (the council having authorised the road to be closed and barriers placed in position) using a 500 ton crane, the 10 ton unit situated on a roof was craned down and loaded to our transport, then we removed it from site. The two new 5 ton exchange units was transferred from our depot, craned up to the roof and positioned onto prepared steel bases. We left site at 0500 hours, barriers removed, road open again just before the rush hour started.