Arriving on the M11 motorway, exit at junction 11 and follow the signs into Cambridge. Pass the Trumpington Park & Ride on the left. Continue on the same road all the way into the city passing through Trumpington, past several large private schools on the right and then a piece of common land (see map) that often has horses/cattle on the left. Ultimately, arrive at a pair of mini-roundabouts adjacent to a large hotel (The Royal Cambridge). Go straight ahead at the first roundabout, then immediately right at the second onto Lensfield road. Turn first left, after about 50 metres, into Tennis Court Road (this is one way!). Note: at all sites, parking is restricted, so you should make arrangements beforehand.
You may also wish to consider using one of the many Park & Ride sites around the edge of the city. Following the directions above, as soon as you've left the M11 and turned right towards Cambridge, the Park & Ride is obvious on the left. Buses depart every ten minutes, from around 7 am until after 7 pm.
PDN is within 5 minutes' walking distance of the Cambridge bus/coach station in Drummer Street. Details of the bus services can be found here.
From Cambridge railway station
The National Rail website may be useful in planning your journey to Cambridge.
Take a taxi from outside the station to Tennis Court Road (About a five minute ride, depending on traffic. It should cost around £8).
Alternatively, walk (15-20 minutes) as follows: follow Station Road from the railway station (see map) to the War Memorial on Hills Road (the first T junction); turn right and follow Hills Road to the Catholic Church (a large blackened stone building on the left) at the corner of Hills Road and Lensfield Road; turn left and follow Lensfield Road to Tennis Court Road (first on the right).
From Stansted airport
A taxi takes about 30 minutes and costs £40-£60.
Alternatively, there is an hourly coach service to Cambridge, see National Express website.
From Heathrow & Gatwick airports
From Heathrow, take the Tube to King's Cross (Picadilly Line)
From Gatwick, take the train to Victoria Station, then the Tube to King's Cross (Victoria Line)
Alternatively from Gatwick, take the train to Victoria, then tube to Liverpool Street (Circle Line)
Trains run frequently between both King's Cross and Liverpool Street stations and Cambridge. Follow the directions above from Cambridge railway station.