YHA St Briavels Castle - Directions St Briavels, Lydney, Gloucestershire, GL15 6RG Get directions via Google Maps Contact information Phone: +44 345 371 9042 Email: [email protected] Map references OS Map: 162 OS Grid Ref: SO558045 Lat/Lng: 51.738112, -2.640796 final.army.unlisted How to get here By car: From the north M6, M5, M50 follow the signs to Monmouth. From there follow A466 to Chepstow. After approximately five miles turn left and follow signs to St Briavels. The castle is straight in front of you. From the south M4, M48 to Chepstow. Follow the A466 to Monmouth. Approximately seven miles after the metal bridge, turn right and follow signs to St Briavels.