Is it just me, or do fleas seem to affect indoor cats far more than those with access to the great outdoors?
I think that being in a warm, constant-temperature environment appears to exacerbate the problem somewhat as there isn't anything to break the flea lifecycle. Maybe keeping the heating off for a while (let the house cool down) would be worth a shot as well.
My two are outdoor cats and fleas are really only a problem in the summer months, which is when you'd expect to have issues. As a result, I only frontline them in the flea season and I see nary a flea between September and June. Because I show one of my cats and the other has a known flea allergy, keeping them flea-free is important, so it is part of their grooming that I check for the little blighters. On the other hand, what I have problems with are harvest mites (chiggers), but that's another story.
Btw, Fleur, your twosome are gorgeous!
Witty.
P.S. Don't forget to worm them as well though - if they have fleas, they may have worms too.