LONDON -- It was an erratic week for the markets of Europe. Starting with optimism from the G20 summit, the mood soon turned sour as it looked like France and Germany would be at odds over the eurozone's debt strategy at the two-day talks scheduled for Thursday and Friday. But the week ended brighter after a compromise was reached that saw plans raised for the creation of a new supervisory body to keep an eye on Europe's banks.

In London, the FTSE 100 (INDEX: ^FTSE) had a strong rally on Friday to end at 5,571, up 57 points (1%), on the week, despite the U.K.'s own bank problems.

Fears receding that Germany would be stuck with the debts of much of Europe helped the DAX (INDEX: ^GDAXI) to an even better Friday, and it ended up 153 points (2.4%) at 6,416. The story was the same in France, with the CAC40 (INDEX: ^FCHI) ending at 3,197, up 106 points, or 3.4%.

In Spain, the IBEX 35 (INDEX: ^IBEX) broke the 7,000 mark, up 226 points (3.3%) to 7,102. The only one that didn't party on Friday was Greece's Athens General Index (INDEX: GD.AT), which finished at 611, just 3 points up.

Perhaps all's jolly in Europe and the crisis is over now. Or perhaps not.

U.K. movers
FTSE 100 banks were in the news for their own reasons, with Barclays losing 17% to fall to 166 pence. The reason? It's just been hit with a 290 million pound fine for its part in fixing the interbank Libor rate. Other banks are also being investigated.

Royal Bank of Scotland lost 14% on the week, falling to 208 pence, after a calamitous technical problem left many of its NatWest and Ulster Bank customers without access to their money.

There weren't many big FTSE 100 risers, but building materials producer CRH put on 11% to 1,220 pence, gas supplier BG Group gained 6.7% to 1,300 pence, and educational publisher Pearson rose 5.3% to 1,268 pence.

Germany and France
Winners on the DAX included agricultural products supplier K+S, which saw its price gain 12% to 36 euros, and chemical and pharmaceuticals company Bayer, which enjoyed a 7.4% rise to 56.78 euros.

There weren't many fallers on the DAX, but semiconductor maker Infineon Technologies did lose 14% to 5.33 euros, after reporting a poor third quarter, and Commerzbank dropped 4.4% to 1.34 euros.

In France, steel maker Vallourec had a good week, ending 12.5% up on 32.17 euros, European Aeronautic Defence and Space Company (better known as EADS) gained 8.6% to 27.94 euros, and project management and engineering consultant Technip rose 7% to 81.95 euros.

The very few fallers included STMicroelectronics, down 2.4% to 4.32 euros, and Publicis Groupe, down 2.4% to 36.05 euros.

Finally, Berkshire Hathaway CEO Warren Buffett has spent more than $1 billion buying the shares of one of the U.K.'s most successful large caps. Clearly, he thinks there are bargains to be had within Britain's FTSE 100, and you can discover the details of his investment -- including the price he paid -- by reading this free report.

The Motley Fool is helping Britain invest. Better. And with the economy so uncertain, we're urging everyone to read "10 Steps to Making a Million in the Market" -- it may transform your wealth. Click here now to request your free, no-obligation copy.

Further investment opportunities:

Alan Oscroft owns no shares mentioned in this article.The Motley Fool owns shares of Berkshire Hathaway and Infinera. Motley Fool newsletter services have recommended buying shares of Berkshire Hathaway and Infinera. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. Try any of our Foolish newsletter services free for 30 days. The Motley Fool has a disclosure policy.