This was a terrific series, but it was completely mis-scheduled. Having said that I also think the pre-publicity was highly misleading, as much was made of this show's similarity to Fame. That's what many were expecting, but that wasn't what ITV delivered.
Britannia High was quite simply a British High School Musical, and a very good one at that. Granted, most of the choreography was poor and dated by comparison to HSM, but the music, acting and scripts were mostly much better.
It was lots of fun, with likeable characters, and it didn't take itself too seriously. But 7pm on a Sunday??? Completely wrong! It is a Saturday tea-time show.
I also think that ITV over anticipated the size of the audience who would tune in for this, hence the blaze of publicity surrounding it. Whilst it lost audience across the run, that's not that unusual. But for this show, the audience weren't even there in the first place with only 3 million or so tuning in for episode 1.
My kiRAB completely loved it though - and there's precious little on TV for them of this quality, so for us Britannia High was a breath of fresh air.