From the M4 going WEST :-
Stay on the M4 until junction 15. Leave the M4 there and head north towards SWINDON
Continue travelling along the A417/419 (for about 30 miles) in the direction of CIRENCESTER/GLOUCESTER. This is dual carriageway for most of the journey. Finally, there is a single carriageway section which takes you to a roundabout beside a pub called "The Air Balloon". Bear right at this roundabout for Cheltenham. After several miles, this takes you to a junction with the A435; turn left onto the A435 and continue, eventually going down the hill into CHELTENHAM.
Try to follow the signs through Cheltenham in direction of EVESHAM. The road is the A435 again. (If you get lost in Cheltenham, and most people do, ask for directions to the Racecourse (horses) and that will put you back on the Evesham Road).
BISHOP'S CLEEVE is several miles north of Cheltenham. As you go round the outskirts of Bishop's Cleeve, there is a left turn to STOKE ORCHARD. You then drive several miles down a country lane to a large gated site (Orchard Business Centre) on the right hand side,