The exact directions are given when you purchase a ticket and can be found in the text of the E-Ticket
Shambala Festival is a green event so festival goers are asked to use the festival’s coaches:
All coaches and coach tickets are for departures on the Thursday of the event.
Morning departures are available from all cities listed on the ticket page.
Thursday early evening departures are available from Bristol and London only.
All tickets include return travel on the Monday after the show.
Get £15 off your adult festival tickets if you buy a Shambala Express package – adult ticket and coach ticket bought together or, £15 towards your coach travel from our other departure points.
Return coaches are available from Bristol, Brighton, London, Birmingham, Manchester and Sheffield.
More info at their website; shambalafestival.org/essential-info/travel/