In reply to Postmanpat: They need a much better system there. At least one that informs you of what to expect if they can't make the changes, eh?
I had loads of problems and lost over a third of my climbing time the first time I went there. Upon taking another friend recently (his first time) we were left waiting for ages at the till after he'd completed the test to re register, he was ten told to re join the huge cue, despite having cued twice already. More dead time.
Just to point out this isn't much to do with the wall staff. The Westway wall is excellent otherwise.
Some small pieces of information like the above point and the op's point, would be really helpful. Also that you need a pound coin for the lockers and you won't get given change inside the centre, or directions to the nearest cash point! (Er.. think it's in Shepard's bush mate)
Incidentally after spending twenty minutes walking up and down the nearest cash point is in a shop about five minutes away. Turn left out of the Westway approach road (walking away from the tube) and it's past the off-licence.