I read this thread while researching the Triptic requirements for my drive from Doha to London. Now that I am back in London I think I can dispel some of the myths.

I drove from Doha through Saudi, Jordan, Syria, Turkey, Greece, Italy, Germany and Holland before taking a ferry to the UK. The car had a Qatari number plate. Saudi first, You do not need a Triptic, just a visa (Transit in my case) which is usually valid for 3 days. There is nowhere to buy a Triptic anywhere near the Jordan border.

Jordan, There is no need for a Triptic or advance visa. This can be bought at the border along with car insurance.

Syria, There is no need for a Triptic. I had a visa from the Syrian Embassy in Doha. Insurance can be bought at the border.

Turkey, There is no need for a Triptic. Visa can be bought at the border along with car insurance.

Greece, no Triptic requirement, Insurance can be bought at the border and covers the whole EU for one month.

Having entered the EU, there are no further visa, insurance or Triptic requirements.

Egypt has a Triptic requirement but is a nightmare to drive in. I would recommend leaving the car in Aqaba and taking the ferry to Nuweiba, where coaches operate to Cairo.