I use Frontline for fleas and ticks best on the market, once on the tick will eventually fall out. A good website to get frontline is (
Welcome to Petmeds.co.uk - Pet Medication Supplies) it is really cheap and three pipettes in a pack cost £17.95 for six months,one pipett every two months. At the vets I used last time cost £47 for six months, they also have a free phone number on the site, hope this helps.