Yes they were using tracks on the 2009 tour, BB had 'in ear' monitoring throughout to keep in sync. I thought it was realised and accepted by everyone. It was done that way to bring in Cliff's pre-recorded vocals should he be a bit hoarse. Apparrantly he had a signal that he gave to the soundman to bring the tracks in when needed. If you watch the DVD you can see Mark Griffiths is nowhere near the notes on his bass at the intro on 'Living Doll', also we noticed at the Sheffield concert that Brian counted in 'Move It' from a click track. I don't like the idea myself but it was most likely done to ensure the tour was completed without Cliff having to cry off some of the shows with a sore throat. We all know that they can do it live, so that has to be the reason.
It's also true that clubs were using self contained acts in order to undercut bands and get rid of their sub-standard backing. During 1979-80 the MU in Leicester was at war with me over backing tracks, as it was I who introduced the concept. I have the newspaper articles to this day with reports of the MU attacking me. There isn't a club in Leicester today with live backing, it's one time I hate being right over an argument, but the musicians were very poor.