Should water recirculate thru the header tank ?

I ask as I was up in the loft last night and every time I could hear the boiler
fire up for the heating, what looked like a overflow pipe starting trickeling
hot water into the header tank.

Is this as it should be or is it yet another problem made for us by the Yeehaa
plumbing company ? (remember the plumber who got caught ****ing in the flower
vase, he installed our boiler)


--
Geoff
www.anoraks.uk.net