After all the travel planning, I missed one important detail. If I start in the UK and loop southward to Italy before heading north to Scandinavia, then I miss the best weather in each region. The only solution: start in Spring in Italy, head to the UK and Scandinavia for mid-Summer, then turn south to spend Fall traveling in Germany, Austria and Hungary.
Which means reversing all my directions.
*sigh* Can be done with about 36 hours of alterations. But I will be thankful in July basking in balmy Scotland instead of sweltering in Sardinia.