If you want something better you'll have to get rid of the pair of separate bath taps and fit a bath mixer instead. These have a knob or lever to switch between the shower outlet via a hose, and the bath filler.
But this is quite a lot of plumbing work! Why don't you simply keep the 'B&Q pipe thing' until you're ready to refurb the bathroom? Good enough for the kids, surely?
Big Al
May 2010