You can't miss it. It's right on the main A38.
From Droitwich - through Fernhill Heath, the park and ride is on the left hand side, straight on through the park & ride traffic lights and The Perdiswell is literally just after on the right hand side before the next set of traffic lights.
From M5 Junction 6 - take the turning signposted Kidderminster, A449, carry on down to the next roundabout, take 2nd left signposted Worcester. Carry on down this road through traffic lights, don't take turning immediately on the left, take the next left - Checketts Lane, go the the end, turn left at the traffic lights, The Perdiswell will be just on the left hand side.
From Worcester city centre - follow the signs for Droitwich, don't turn off anywhere, and you'll eventually see The Perdiswell on the left hand side after the traffic lights mentioned above.
Hope this helps, I think I've covered the main routes. BTW I'd love to come along as well, but I'll let you know at the time as Babe is due 1st Sept.