Oh, ok, thanks. To get maximum benefit out of your drenching for now and the future do a FEC, ask if you need to drench at all (white would often be inappropriate/ineffective in many places at this time of year), if you simply feel you have to worm them as you have seen tape and can't live with not worming then check that the drench you use has a claim against Tapeworm at all and then do a post-drench FEC to gauge resistance or lack thereof to what ever you used.
It may be that they don't need worming at all, or who knows the white drench may clear everything out and you don't need the Startec. If your vet doesn't do FECs send it away, it will be a very beneficial informative process.