There's Frontline Combo and Frontline Spot On. Combo is prescription only but Spot On is not. Spot On can be found for as little as £15 online (for 6), Combo is more expensive at £25.

As far as we could find out, Combo kills fleas and flea eggs whereas Spot On only kills the fleas.

This Advocate stuff sounds like it could be good if it worms as well.