The UKFrance Sampler is a new rail-drive package from Rail Europe. The package combines three consecutive days of Avis car rental in the United Kingdom, three days of unlimited rail travel in France within a one-month period, and a one-way ticket on Eurostar through the Channel Tunnel between London and Paris, with the option of starting in either country. In addition, you can drop off or pick up your car at the new Ashford Eurostar station in Kent (about 60 miles from London) and bypass all that London traffic. Rates start at $241 per person when two travel together (from $304.50 per person first class). Call (800) 4-EURAIL.