multiple accounts in ical after upgrading to iCloud

I have upgraded my Mac to Lion and I have now moved my previous mobileme account. I have found that my iCal application on my Mac is creating multiple CalDAV accounts that duplicate my calendar entries. If I try to delete these accounts they just come back - I have counted 44 of them listed!

I cant see the same if I log into iCloud to view my Calendar there.

Please help me reset this on my Mac so I have just the one account.