When approaching from the B2163, once off the main road you will then pass Marlpit farm on your left, before reaching a crossroad. Go straight over, and after a few hundred yards the sanctuary drive will come up (sharply) on your right. You should then proceed down the tree-lined driveway (taking care over the speed humps), before turning into the double gates on your left and into our carpark.
As Buttercups is rather in the middle of the countryside, public transport is a little limited and the nearest bus stop approximately a mile away at Marlpit Farm, with Bus routes 59. 66 and 89 stopping throughout the day. This approach will then require a walk down a country road, however there are a couple of alternative footpaths approaching from Chart Sutton and Linton if you don't mind a walk!
The best way to get to the sanctuary via public transport would be by a combination of train and taxi. Depending on which direction you are coming from, this would either be to Maidstone East OR West station, or Staplehurst Station, with taxis being available direct from both. It is then only a 10/15 minute drive to Buttercups!