There is much to commend in the rebuilt Sadler's Wells, but I have a reservation about the comment in your review that ' . . . everyone has a perfect view' (aj 19.11.98). As can be seen from the plan you reproduce, the seats are not generally staggered. This does not matter too much at the sides of the rows, but in the centre one is sometimes directly behind the head in front. Also, some of the very end seats in the stalls and first circle have part of the stage obscured by the side gallery seats close to the stage.
The theatre was built mainly for ballet, so perhaps thought was not given to opera performances with subtitles, which are obscured by the overhang for some members of the audience in the rear stalls and rear first circle. Perhaps the statement in your report should have been tested first on members of the audience, not just taken from the architects.
GEOFFREY A COLLENS