If you are travelling to Home Park by car between 25th February and November there are major roadworks planned for Outland Road (between the Manadon junction of the A38 and Home Park). These are likely to cause severe delay.
An alternative route is: to stay on the A38 past Manadon to the next junction (signed Devonport) and follow the signs to City Centre, this will bring you to Milehouse (with the Britannia pub on your left). Turn left here and take the next right into the car park.
Please also be aware that there will be works on the A386 outside the train station for some of that period too.