So while my mum was here, we decided to knit B a new jumper, as he was rapidly growing out of his other handknits and it was freezing! I chose the Master Charles jumper (rav link), in most excellent red Rowan Pure Wool Aran.
We knit size two, with slightly longer sleeves, and it fits just fine. It looks 'very smart' (in B's words) and was a quick knit thanks to aran weight yarn (and two knitters!). And I love that front cable panel.