How can I avoid duplicates on importing ics files

I'm a new Mac user and would like to start using the Mac for everything including my diary.
For a while I will be working in parallel with another calendar (I'm using the Lightning add-in to Thunderbird).
Scenario as follows:
Export events from Lightning in ics format.
Import into iCal - works fine.
The Lightning calendar is updated - events added and updated and then re-exported.
When I import again into iCal, instead of updating events previously imported, duplicate events are created.
This appears to be because iCal is assigning a new UID to every event that it imports. If iCal used the UID defined in the input stream, it would work fine.
The iCal standard (RFC2446 http://tools.ietf.org/html/rfc2446 ) states:
CUAs must persist the following component properties: "UID", "RECURRENCE-ID", "SEQUENCE", and "DTSTAMP".
If iCal is not persisting the UID, then it would appear to be breaking the iCalendar Transport-Independent Interoperability Protocol as defined in the referenced RFC.
Is there a workaround or any hope that iCal might be fixed to comply with the standard?
Thanks

On your Mac, for duplicates, switching Contacts off then back on in System Preferences > iCloud may prevent duplicates.
On the iPhone / iPad tap Settings > iCloud. Make sure Contacts and Calendars are swtiched on.
Try restarting your Mac and your iOS devices when items won't sync as they should.
To restart an iOS device:  Hold the On/Off Sleep/Wake button down until the red slider appears. Slide your finger across the slider to turn off iPhone. To turn iPhone back on, press and hold the On/Off Sleep/Wake button until the Apple logo appears.

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