Thanks for the suggestion, Dan D, but I'd like a new bike - and I'm edging toward the Giant. It'd be through a cycle to work scheme, and for goods costing just under £600 I'd pay a net price of ~£368 (if my calculations so far are correct, and as long as HM Revenue & Customs don't change their part of the bargain like they did recently!). There is also the fuel and vehicle wear and tear to take into account, but that may be counter-acted by bike-related costs.
My old bike, an 8-year-old hybrid I'd keep for ferrying my little girl around on.
Now, if Sky could cycle alongside with his bar, that'd be a great commute!