From
TravelwestAvonRider tickets will be valid for travel across the zone boundary on service D1 as far as Westbury (Haynes Road), on services D3 and X72 as far as Bowerhill (Kingfisher Drive), and on service X31 as far as Chippenham (Bus Station). AvonRider tickets may also be purchased by passengers boarding these services from those places inward to Bath.
More information on AvonRider tickets is available at
www.travelwest.info/riderI'd imagine many of grahame's bus corridor integration Christmasses have come at once, given the D3 and X72 will now combine to offer a weekday every 15 minutes frequency between Melksham Market Place and Bath:
Faresaver X72 TimetableFirst D3 Timetable