We attended on the 18/9 for the first concert of this run. It was dreadful as has been commented on by many other reviewers. We've seen many RS concerts and can only conclude that he's unwell or it was a tribute act. No communication with the audience, long passages where he wasn't on stage and very few of his hits.
If this is the best he can do now then he should retire before he destroys his reputation as a world class entertainers - which he used to be.