Well, they have past the £20k barrier over here about a month ago - so similar prices to eGolf.
http://www.pistonheads.com/classifieds/used-cars/bmw/i3/bmw-i3-vat-qualifying-1-owner/4202273
Here is a well used example up at just over £16k:
BEV with good spec including DC charging, met paint, Pro Screen, HV prep, :
http://www.pistonheads.com/classifieds/used-cars/bmw/i3/2014-bmw-i3-silver/4396554
http://www.pistonheads.com/classifieds/used-cars/bmw/i3/bmw-i3-vat-qualifying-1-owner/4202273
Here is a well used example up at just over £16k:
BEV with good spec including DC charging, met paint, Pro Screen, HV prep, :
http://www.pistonheads.com/classifieds/used-cars/bmw/i3/2014-bmw-i3-silver/4396554