A group of 18 men will set off tomorrow in a convoy of Porsche 944 sports cars for the most northerly tip of Europe – Nordkapp in Norway.
They hope to reach their destination in time for midnight on Saturday’s summer solstice after driving almost 3,000 miles.
Each of their nine vehicles – built between 1982 and 1991 –will have cost less than £1,100.
Most of the drivers come from in and around Berkhamsted and Tring – including James Percival, 45.
He said: “It is going to be quite tough and we are not going to get a lot of sleep. We will have been driving solidly for two days and one night before we stop at all. We are going to have some issues along the way and some break-downs given the cars we are driving.
“It is going to be a painful form of enjoyment, I think. It is going to be tiring and there will be a lot of banter over our walkie talkies.”
About half of the people on the trip are parents of children who go to Berkhamsted School, including Mr Percival, who lives nearby in Castle Hill.
The rally of old cars is the third organised by Andy Green, of Wigginton, to raise cash for charity Help for Heroes. So far more than £85,000 has been collected.
Each rally is followed by a fundraising ball. The drivers are now hoping to bring the figure up to at least £130,000.
In the first, they drove to Kalkan, Turkey, in British MG sports cars, and in the second, they went to Agadir, Morocco, in Jaguar XJS luxury cars.
Mr Green said: “Well, unlike the famous 80s pop duo we can’t “Go West”. We have been east to Turkey and south to Morocco. This only leaves us with north – so it’s to the land of the midnight sun.”
Their route will take them through London, Brussels, Berlin, Warsaw, Vilnius in Lithuania, Riga in Latvia, Tallinn in Estonia, and Helsinki and Oulu in Finland.