It's been a long time since I updated this thread, but as time has passed my daughter didn't really take to BMX and the red & white one got sold, replaced by a 24" Hoy Bonalay and now a 26" Islabike Bienn large.
However they say the apple doesn't fall far from the tree and my son is now 10 and has recently re-found his BMX soul and is enjoying tracks and a few trails with me. I started looking for a bigger bike but realised that his Redline had an 18.75" top tube so it was already an expert sized bike and just need a few new parts rather than a whole new bike.
A bit of research later and one of the usual suspect riders came up with some 23"x6.5" bars and I did a bit of a tyre change a and stripped off the pointless front caliper brake.......
From this
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