Sudeley Castle is a 5 minute drive or a 25 minute walk from Winchcombe, and a 20 minute drive from Cheltenham.
Below are some phone numbers for local taxi companies if you need transportation at the end of the night:
dial-a-cab - 01242 242424
Starline Taxis - 01242 250250
Five Star Taxis - 01452 555555
Cheltenham Cabs - 07742 524252
Royal Cars Royal Cars Taxi and Private Hire - 01452 500000
Three2One Taxis - 01452 321321