Electrum exchange rates. Where do they come from and why are they incorrect? On the simple view on the Electrum client, the value of the bitcoins is displayed in USD, GBP and EUR (changeable by clicking on it).

Currently by clicking through, I am seeing exchange rates:


10.29GBP/BTC
10.40EUR/BTC
11.90USD/BTC


This is completely out of line with mtgox, and also completely out of line with international currency markets (currently 1.6usd/gbp and 1.24eur/gbp)

So could someone explain where these rates come from and why they are so incorrect?
As of this writing, Electrum retrieves its exchange rate from Intersango. The last sale there must have been abnormally low for the current exchange rate.