Why are there so many tickets left for the LSO's concert performances of Der Freischütz later in week? There are plenty of decent seats for under £20 so it can't be the cost.
I was lucky enough to attend a couple of rehearsals last week. The casting is superb, Sir Colin is in his element and you can avoid Widdecombe (truly dire, believe me) at the ROH. What more persuasion do you need?