How to get to Durham
Durham is about 30 min. by car south of Newcastle upon Tyne. Find the A1 and leave it at exit Durham. From the south take exit 61 (Bowburn) and follow the A177 to Durham.
If you arrive at the airport, you can take a Taxi directly from the airport. The price should be roughly £30 one-way to Durham (and take about 25 minutes). If you split a taxi between 3 it is about the same as the train/metro.
There are bus connections to Durham or Newcastle from most major cities in England.
The Intercity East-Coast line links Durham with London King's Cross and Edinburgh. Most Intercity trains stop in Durham. Otherwise you have to take a local train or taxi (less than 20 GBP) from Newcastle Central station. (You could consider the train from Paris which takes roughly 6 hours.) Timetable information is available from National Rail
By metro/train from the Airport
There is a direct metro link from the airport to the central train station in Newcastle, from which you can take a mainline train directly to Durham. These are very frequent and take 12 minutes. The whole journey takes about 50 minutes.
The airports in Edinburgh and Manchester also have good train connection to Durham. So does London, but the train ride takes considerably longer.
The Institute is located in the Ogden Centre for Fundamental Physics, adjacent to the main Physics Department building on the University Science Site. If you are arriving by train it is a 20 minute walk from the railway station to the Department, or you can take a taxi. The Ogden Centre is number 12 on the University map below.