That's cool ... I'd be happy enough to give this a go, in theory...
Actually, I'm pretty embarrassed to admit that this problem turned out to be user error.
I entered my wifi password in upper case rather than lower case. Doh.
The one thing to come out this that might be useful feedback for you is that I assumed, totally incorrectly and stupidly that the on-screen keyboard had no lower-case section. I found it eventually by paging down enough. I think I'm conditioned from on-screen keyboards on mobile phones to expect a 'shift' key and to see the keyboard letters change accordingly.