Did SWT have any plans on replacing the 455s. I ask because I find it amusing that I see lots of people on twitter complaining about these units saying "SWT wouldn't tolerate these old, dirty things..." But as far as I'm aware, SWT would've kept the 455s for much longer since they've been retractioned. I'm looking forward to these, they'll be a positive change and seats don't bother me. I am 'concerned' about air con though, 345s seem alright but 710s always seem set very cold although I haven't been on one since the weather turned back to constant grey skies.