On the A35 from Poole to Dorchester take the first exit onto the A351 at the Baker's Arms roundabout.
It is signposted Wareham, Swanage.
Go straight on at the next roundabout, then straight on at the next lights.
Pass the "SANDFORD" sign and then go straight on at the next roundabout.
Take the next turning on the left - this is Keysworth Drive.
If you are using your SATNAV the postcode is BH20 7BD.