see this
http://www.hyndburncircular.co.uk/
I think from accy its the 6 there and the 7 back (only cos its other way round in harwood) if you got the 7 there it would take you all the way thru gt harwood whereas the 6 will take you straight to blackburn. But looking at the bus that comes from accy may not go to the roundabout side of whitebirk and you might have to get off at intack and walk down whitebirk road to the little roundabout