Meldreth is about 10 miles south of Cambridge off the A10. It is about a mile outside Royston (towards Cambridge). Signposted to Meldreth from the A10, follow the signs to Meldreth (turn first right just after the A10 exit), go through Meldreth village to the end, left at the fork 100 yds on the left is the school car park.
You can get to the A10 from A1 or the M11 via the A505 (signposted to Royston).